diff --git a/app/Actions/Jetstream/AddOrganizationMember.php b/app/Actions/Jetstream/AddOrganizationMember.php
index 7a84d53f..dd43ee5d 100644
--- a/app/Actions/Jetstream/AddOrganizationMember.php
+++ b/app/Actions/Jetstream/AddOrganizationMember.php
@@ -8,6 +8,7 @@ use App\Models\Organization;
 use App\Models\User;
 use Closure;
 use Illuminate\Contracts\Validation\Rule;
+use Illuminate\Contracts\Validation\ValidationRule;
 use Illuminate\Database\Eloquent\Builder;
 use Illuminate\Support\Facades\Gate;
 use Illuminate\Support\Facades\Validator;
@@ -59,7 +60,7 @@ class AddOrganizationMember implements AddsTeamMembers
     /**
      * Get the validation rules for adding a team member.
      *
-     * @return array<string, array<Rule|string>>
+     * @return array<string, array<ValidationRule|Rule|string>>
      */
     protected function rules(): array
     {
diff --git a/app/Actions/Jetstream/InviteOrganizationMember.php b/app/Actions/Jetstream/InviteOrganizationMember.php
index 686a9978..a73ebac2 100644
--- a/app/Actions/Jetstream/InviteOrganizationMember.php
+++ b/app/Actions/Jetstream/InviteOrganizationMember.php
@@ -34,7 +34,7 @@ class InviteOrganizationMember implements InvitesTeamMembers
 
         InvitingTeamMember::dispatch($organization, $email, $role);
 
-        /** @var TeamInvitation $invitation */
+        /** @var OrganizationInvitation $invitation */
         $invitation = $organization->teamInvitations()->create([
             'email' => $email,
             'role' => $role,
diff --git a/app/Exceptions/Api/ApiException.php b/app/Exceptions/Api/ApiException.php
index bcd5ae01..e68bcc50 100644
--- a/app/Exceptions/Api/ApiException.php
+++ b/app/Exceptions/Api/ApiException.php
@@ -11,6 +11,8 @@ use LogicException;
 
 abstract class ApiException extends Exception
 {
+    public const string KEY = 'api_exception';
+
     /**
      * Render the exception into an HTTP response.
      */
@@ -29,11 +31,13 @@ abstract class ApiException extends Exception
      */
     public function getKey(): string
     {
-        if (defined(static::class.'::KEY')) {
-            return static::KEY;
+        $key = static::KEY;
+
+        if ($key === ApiException::KEY) {
+            throw new LogicException('API exceptions need the KEY constant defined.');
         }
 
-        throw new LogicException('API exceptions need the KEY constant defined.');
+        return $key;
     }
 
     /**
diff --git a/app/Exceptions/Api/TimeEntryStillRunningApiException.php b/app/Exceptions/Api/TimeEntryStillRunningApiException.php
index e110a9ae..c153534c 100644
--- a/app/Exceptions/Api/TimeEntryStillRunningApiException.php
+++ b/app/Exceptions/Api/TimeEntryStillRunningApiException.php
@@ -6,5 +6,5 @@ namespace App\Exceptions\Api;
 
 class TimeEntryStillRunningApiException extends ApiException
 {
-    const string KEY = 'time_entry_still_running';
+    public const string KEY = 'time_entry_still_running';
 }
diff --git a/app/Exceptions/Api/UserNotPlaceholderApiException.php b/app/Exceptions/Api/UserNotPlaceholderApiException.php
index 2aae88c9..92af4739 100644
--- a/app/Exceptions/Api/UserNotPlaceholderApiException.php
+++ b/app/Exceptions/Api/UserNotPlaceholderApiException.php
@@ -6,5 +6,5 @@ namespace App\Exceptions\Api;
 
 class UserNotPlaceholderApiException extends ApiException
 {
-    const string KEY = 'user_not_placeholder';
+    public const string KEY = 'user_not_placeholder';
 }
diff --git a/app/Filament/Resources/OrganizationResource.php b/app/Filament/Resources/OrganizationResource.php
index 3c14a313..eb2a9e0d 100644
--- a/app/Filament/Resources/OrganizationResource.php
+++ b/app/Filament/Resources/OrganizationResource.php
@@ -74,7 +74,7 @@ class OrganizationResource extends Resource
                         // TODO: different disk!
                         try {
                             /** @var ReportDto $report */
-                            $report = app(ImportService::class)->import($record, $data['type'], Storage::disk('public')->get($data['file']), []);
+                            $report = app(ImportService::class)->import($record, $data['type'], Storage::disk('public')->get($data['file']));
                             Notification::make()
                                 ->title('Import successful')
                                 ->success()
@@ -98,9 +98,10 @@ class OrganizationResource extends Resource
                                 ->send();
                         }
                     })
-                    ->tooltip(fn (Organization $record): string => "Import into {$record->name}")
+                    ->tooltip(fn (Organization $record): string => 'Import into '.$record->name)
                     ->form([
                         Forms\Components\FileUpload::make('file')
+                            // TODO: disk!
                             ->label('File')
                             ->required(),
                         Select::make('type')
diff --git a/app/Filament/Resources/TaskResource.php b/app/Filament/Resources/TaskResource.php
index 0ed06bd6..d4be3651 100644
--- a/app/Filament/Resources/TaskResource.php
+++ b/app/Filament/Resources/TaskResource.php
@@ -6,9 +6,12 @@ namespace App\Filament\Resources;
 
 use App\Filament\Resources\TaskResource\Pages;
 use App\Models\Task;
+use Filament\Forms;
+use Filament\Forms\Components\Select;
 use Filament\Forms\Form;
 use Filament\Resources\Resource;
 use Filament\Tables;
+use Filament\Tables\Filters\SelectFilter;
 use Filament\Tables\Table;
 
 class TaskResource extends Resource
@@ -25,7 +28,18 @@ class TaskResource extends Resource
     {
         return $form
             ->schema([
-                //
+                Forms\Components\TextInput::make('name')
+                    ->label('Name')
+                    ->required()
+                    ->maxLength(255),
+                Select::make('project_id')
+                    ->relationship(name: 'project', titleAttribute: 'name')
+                    ->searchable(['name'])
+                    ->required(),
+                Select::make('organization_id')
+                    ->relationship(name: 'organization', titleAttribute: 'name')
+                    ->searchable(['name'])
+                    ->required(),
             ]);
     }
 
@@ -46,7 +60,9 @@ class TaskResource extends Resource
                     ->sortable(),
             ])
             ->filters([
-                //
+                SelectFilter::make('organization')
+                    ->relationship('organization', 'name')
+                    ->searchable(),
             ])
             ->defaultSort('created_at', 'desc')
             ->actions([
diff --git a/app/Filament/Resources/TimeEntryResource.php b/app/Filament/Resources/TimeEntryResource.php
index ca70c0db..56ac3898 100644
--- a/app/Filament/Resources/TimeEntryResource.php
+++ b/app/Filament/Resources/TimeEntryResource.php
@@ -14,6 +14,7 @@ use Filament\Forms\Form;
 use Filament\Resources\Resource;
 use Filament\Tables;
 use Filament\Tables\Columns\TextColumn;
+use Filament\Tables\Filters\SelectFilter;
 use Filament\Tables\Table;
 
 class TimeEntryResource extends Resource
@@ -67,6 +68,7 @@ class TimeEntryResource extends Resource
         return $table
             ->columns([
                 TextColumn::make('description')
+                    ->searchable()
                     ->label('Description'),
                 TextColumn::make('user.email')
                     ->label('User'),
@@ -89,7 +91,9 @@ class TimeEntryResource extends Resource
                     ->sortable(),
             ])
             ->filters([
-                //
+                SelectFilter::make('organization')
+                    ->relationship('organization', 'name')
+                    ->searchable(),
             ])
             ->defaultSort('created_at', 'desc')
             ->actions([
diff --git a/app/Http/Controllers/Api/V1/ImportController.php b/app/Http/Controllers/Api/V1/ImportController.php
index 877c8c61..a3bd4040 100644
--- a/app/Http/Controllers/Api/V1/ImportController.php
+++ b/app/Http/Controllers/Api/V1/ImportController.php
@@ -26,8 +26,7 @@ class ImportController extends Controller
             $report = $importService->import(
                 $organization,
                 $request->input('type'),
-                $request->input('data'),
-                $request->input('options')
+                $request->input('data')
             );
 
             return new JsonResponse([
diff --git a/app/Http/Requests/V1/Project/ProjectStoreRequest.php b/app/Http/Requests/V1/Project/ProjectStoreRequest.php
index 09bf72dc..ca57a537 100644
--- a/app/Http/Requests/V1/Project/ProjectStoreRequest.php
+++ b/app/Http/Requests/V1/Project/ProjectStoreRequest.php
@@ -6,6 +6,7 @@ namespace App\Http\Requests\V1\Project;
 
 use App\Models\Client;
 use App\Models\Organization;
+use App\Rules\ColorRule;
 use Illuminate\Contracts\Validation\ValidationRule;
 use Illuminate\Database\Eloquent\Builder;
 use Illuminate\Foundation\Http\FormRequest;
@@ -35,6 +36,7 @@ class ProjectStoreRequest extends FormRequest
                 'required',
                 'string',
                 'max:255',
+                new ColorRule(),
             ],
             'client_id' => [
                 'nullable',
diff --git a/app/Http/Requests/V1/Project/ProjectUpdateRequest.php b/app/Http/Requests/V1/Project/ProjectUpdateRequest.php
index 28ed09ad..82259815 100644
--- a/app/Http/Requests/V1/Project/ProjectUpdateRequest.php
+++ b/app/Http/Requests/V1/Project/ProjectUpdateRequest.php
@@ -6,6 +6,7 @@ namespace App\Http\Requests\V1\Project;
 
 use App\Models\Client;
 use App\Models\Organization;
+use App\Rules\ColorRule;
 use Illuminate\Contracts\Validation\ValidationRule;
 use Illuminate\Database\Eloquent\Builder;
 use Illuminate\Foundation\Http\FormRequest;
@@ -34,6 +35,7 @@ class ProjectUpdateRequest extends FormRequest
                 'required',
                 'string',
                 'max:255',
+                new ColorRule(),
             ],
             'client_id' => [
                 'nullable',
diff --git a/app/Http/Requests/V1/TimeEntry/TimeEntryIndexRequest.php b/app/Http/Requests/V1/TimeEntry/TimeEntryIndexRequest.php
index 0d3bb8be..92d9a591 100644
--- a/app/Http/Requests/V1/TimeEntry/TimeEntryIndexRequest.php
+++ b/app/Http/Requests/V1/TimeEntry/TimeEntryIndexRequest.php
@@ -30,10 +30,7 @@ class TimeEntryIndexRequest extends FormRequest
                 'uuid',
                 new ExistsEloquent(User::class, null, function (Builder $builder): Builder {
                     /** @var Builder<User> $builder */
-                    return $builder->whereHas('organizations', function (Builder $builder) {
-                        /** @var Builder<Organization> $builder */
-                        return $builder->whereKey($this->organization->getKey());
-                    });
+                    return $builder->belongsToOrganization($this->organization);
                 }),
             ],
             // Filter only time entries that have a start date before (not including) the given date (example: 2021-12-31)
diff --git a/app/Http/Requests/V1/TimeEntry/TimeEntryStoreRequest.php b/app/Http/Requests/V1/TimeEntry/TimeEntryStoreRequest.php
index b2441819..8cbfd2fb 100644
--- a/app/Http/Requests/V1/TimeEntry/TimeEntryStoreRequest.php
+++ b/app/Http/Requests/V1/TimeEntry/TimeEntryStoreRequest.php
@@ -33,10 +33,7 @@ class TimeEntryStoreRequest extends FormRequest
                 'uuid',
                 new ExistsEloquent(User::class, null, function (Builder $builder): Builder {
                     /** @var Builder<User> $builder */
-                    return $builder->whereHas('organizations', function (Builder $builder) {
-                        /** @var Builder<Organization> $builder */
-                        return $builder->whereKey($this->organization->getKey());
-                    });
+                    return $builder->belongsToOrganization($this->organization);
                 }),
             ],
             // ID of the task that the time entry should belong to
diff --git a/app/Models/Organization.php b/app/Models/Organization.php
index 284675d4..5e6a99c3 100644
--- a/app/Models/Organization.php
+++ b/app/Models/Organization.php
@@ -13,6 +13,7 @@ use Illuminate\Database\Eloquent\Relations\HasMany;
 use Laravel\Jetstream\Events\TeamCreated;
 use Laravel\Jetstream\Events\TeamDeleted;
 use Laravel\Jetstream\Events\TeamUpdated;
+use Laravel\Jetstream\Jetstream;
 use Laravel\Jetstream\Team as JetstreamTeam;
 
 /**
@@ -21,6 +22,7 @@ use Laravel\Jetstream\Team as JetstreamTeam;
  * @property bool $personal_team
  * @property User $owner
  * @property Collection<User> $users
+ * @property Collection<string, User> $realUsers
  *
  * @method HasMany<OrganizationInvitation> teamInvitations()
  * @method static OrganizationFactory factory()
@@ -64,7 +66,7 @@ class Organization extends JetstreamTeam
     /**
      * Get all the non-placeholder users of the organization including its owner.
      *
-     * @return Collection<User>
+     * @return Collection<string, User>
      */
     public function allRealUsers(): Collection
     {
@@ -78,6 +80,19 @@ class Organization extends JetstreamTeam
         });
     }
 
+    /**
+     * Get all the users that belong to the team.
+     *
+     * @return BelongsToMany<User>
+     */
+    public function users(): BelongsToMany
+    {
+        return $this->belongsToMany(Jetstream::userModel(), Jetstream::membershipModel())
+            ->withPivot('role')
+            ->withTimestamps()
+            ->as('membership');
+    }
+
     /**
      * @return BelongsToMany<User>
      */
diff --git a/app/Providers/AppServiceProvider.php b/app/Providers/AppServiceProvider.php
index 1aa92645..2674c1bf 100644
--- a/app/Providers/AppServiceProvider.php
+++ b/app/Providers/AppServiceProvider.php
@@ -46,6 +46,7 @@ class AppServiceProvider extends ServiceProvider
 
         Model::preventLazyLoading(! $this->app->isProduction());
         Model::preventSilentlyDiscardingAttributes(! $this->app->isProduction());
+        Model::preventAccessingMissingAttributes(! $this->app->isProduction());
         Relation::enforceMorphMap([
             'membership' => Membership::class,
             'organization' => Organization::class,
diff --git a/app/Providers/JetstreamServiceProvider.php b/app/Providers/JetstreamServiceProvider.php
index e3757c7c..414fe1b5 100644
--- a/app/Providers/JetstreamServiceProvider.php
+++ b/app/Providers/JetstreamServiceProvider.php
@@ -109,5 +109,8 @@ class JetstreamServiceProvider extends ServiceProvider
             'time-entries:delete:own',
             'organizations:view',
         ])->description('Editor users have the ability to read, create, and update.');
+
+        Jetstream::role('placeholder', 'Placeholder', [
+        ])->description('Placeholders are used for importing data. They cannot log in and have no permissions.');
     }
 }
diff --git a/app/Rules/ColorRule.php b/app/Rules/ColorRule.php
new file mode 100644
index 00000000..68dda354
--- /dev/null
+++ b/app/Rules/ColorRule.php
@@ -0,0 +1,32 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Rules;
+
+use App\Service\ColorService;
+use Closure;
+use Illuminate\Contracts\Validation\ValidationRule;
+use Illuminate\Translation\PotentiallyTranslatedString;
+
+class ColorRule implements ValidationRule
+{
+    /**
+     * Run the validation rule.
+     *
+     * @param  Closure(string): PotentiallyTranslatedString  $fail
+     */
+    public function validate(string $attribute, mixed $value, Closure $fail): void
+    {
+        if (! is_string($value)) {
+            $fail(__('validation.string'));
+
+            return;
+        }
+        if (! app(ColorService::class)->isValid($value)) {
+            $fail(__('validation.color'));
+
+            return;
+        }
+    }
+}
diff --git a/app/Service/ColorService.php b/app/Service/ColorService.php
index a58e459b..e9ff97c0 100644
--- a/app/Service/ColorService.php
+++ b/app/Service/ColorService.php
@@ -31,8 +31,15 @@ class ColorService
         '#78909c',
     ];
 
+    private const string VALID_REGEX = '/^#[0-9a-f]{6}$/';
+
     public function getRandomColor(): string
     {
         return self::COLORS[array_rand(self::COLORS)];
     }
+
+    public function isValid(string $color): bool
+    {
+        return preg_match(self::VALID_REGEX, $color) === 1;
+    }
 }
diff --git a/app/Service/Import/ImportDatabaseHelper.php b/app/Service/Import/ImportDatabaseHelper.php
index fa5551ae..4f169614 100644
--- a/app/Service/Import/ImportDatabaseHelper.php
+++ b/app/Service/Import/ImportDatabaseHelper.php
@@ -4,9 +4,11 @@ declare(strict_types=1);
 
 namespace App\Service\Import;
 
+use App\Service\Import\Importers\ImportException;
 use Closure;
 use Illuminate\Database\Eloquent\Builder;
 use Illuminate\Database\Eloquent\Model;
+use Illuminate\Support\Facades\Log;
 
 /**
  * @template TModel of Model
@@ -23,9 +25,15 @@ class ImportDatabaseHelper
      */
     private array $identifiers;
 
+    /**
+     * @var array<string, string>|null
+     */
     private ?array $mapIdentifierToKey = null;
 
-    private array $mapNewAttach = [];
+    /**
+     * @var array<string, string>
+     */
+    private array $mapExternalIdentifierToInternalIdentifier = [];
 
     private bool $attachToExisting;
 
@@ -57,7 +65,11 @@ class ImportDatabaseHelper
         return (new $this->model)->query();
     }
 
-    private function createEntity(array $identifierData, array $createValues): string
+    /**
+     * @param  array<string, mixed>  $identifierData
+     * @param  array<string, mixed>  $createValues
+     */
+    private function createEntity(array $identifierData, array $createValues, ?string $externalIdentifier): string
     {
         $model = new $this->model();
         foreach ($identifierData as $identifier => $identifierValue) {
@@ -72,34 +84,97 @@ class ImportDatabaseHelper
             ($this->afterCreate)($model);
         }
 
-        $this->mapIdentifierToKey[$this->getHash($identifierData)] = $model->getKey();
+        $hash = $this->getHash($identifierData);
+        $this->mapIdentifierToKey[$hash] = $model->getKey();
         $this->createdCount++;
 
+        if ($externalIdentifier !== null) {
+            $this->mapExternalIdentifierToInternalIdentifier[$externalIdentifier] = $hash;
+        }
+
         return $model->getKey();
     }
 
+    /**
+     * @param  array<string, mixed>  $data
+     */
     private function getHash(array $data): string
     {
-        return md5(json_encode($data));
+        $jsonData = json_encode($data);
+        if ($jsonData === false) {
+            throw new \RuntimeException('Failed to encode data to JSON');
+        }
+
+        return md5($jsonData);
     }
 
-    public function getKey(array $identifierData, array $createValues = []): string
+    /**
+     * @param  array<string, mixed>  $identifierData
+     * @param  array<string, mixed>  $createValues
+     *
+     * @throws ImportException
+     */
+    public function getKey(array $identifierData, array $createValues = [], ?string $externalIdentifier = null): string
     {
         $this->checkMap();
 
+        $this->validateIdentifierData($identifierData);
+
         $hash = $this->getHash($identifierData);
         if ($this->attachToExisting) {
             $key = $this->mapIdentifierToKey[$hash] ?? null;
             if ($key !== null) {
+                if ($externalIdentifier !== null) {
+                    $this->mapExternalIdentifierToInternalIdentifier[$externalIdentifier] = $hash;
+                }
+                Log::debug('HIT', [
+                    'class' => $this->model,
+                ]);
+
                 return $key;
             }
 
-            return $this->createEntity($identifierData, $createValues);
+            Log::debug('MISS', [
+                'class' => $this->model,
+            ]);
+
+            return $this->createEntity($identifierData, $createValues, $externalIdentifier);
         } else {
             throw new \RuntimeException('Not implemented');
         }
     }
 
+    /**
+     * @param  array<string, mixed>  $identifierData
+     *
+     * @throws ImportException
+     */
+    private function validateIdentifierData(array $identifierData): void
+    {
+        if (array_keys($identifierData) !== $this->identifiers) {
+            throw new ImportException('Invalid identifier data');
+        }
+    }
+
+    public function getKeyByExternalIdentifier(string $externalIdentifier): ?string
+    {
+        $hash = $this->mapExternalIdentifierToInternalIdentifier[$externalIdentifier] ?? null;
+        if ($hash === null) {
+            return null;
+        }
+
+        return $this->mapIdentifierToKey[$hash] ?? null;
+    }
+
+    /**
+     * @return array<string>
+     */
+    public function getExternalIds(): array
+    {
+        // Note: Otherwise the external ids are integers
+        return array_map(fn ($value) => (string) $value, array_keys($this->mapExternalIdentifierToInternalIdentifier));
+    }
+
     private function checkMap(): void
     {
         if ($this->mapIdentifierToKey === null) {
diff --git a/app/Service/Import/ImportService.php b/app/Service/Import/ImportService.php
index 0c442c15..8f42a756 100644
--- a/app/Service/Import/ImportService.php
+++ b/app/Service/Import/ImportService.php
@@ -16,13 +16,13 @@ class ImportService
     /**
      * @throws ImportException
      */
-    public function import(Organization $organization, string $importerType, string $data, array $options): ReportDto
+    public function import(Organization $organization, string $importerType, string $data): ReportDto
     {
         /** @var ImporterContract $importer */
         $importer = app(ImporterProvider::class)->getImporter($importerType);
         $importer->init($organization);
-        DB::transaction(function () use (&$importer, &$data, &$options, &$organization) {
-            $importer->importData($data, $options);
+        DB::transaction(function () use (&$importer, &$data) {
+            $importer->importData($data);
         });
 
         return $importer->getReport();
diff --git a/app/Service/Import/Importers/ClockifyProjectsImporter.php b/app/Service/Import/Importers/ClockifyProjectsImporter.php
new file mode 100644
index 00000000..5debbf91
--- /dev/null
+++ b/app/Service/Import/Importers/ClockifyProjectsImporter.php
@@ -0,0 +1,143 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Service\Import\Importers;
+
+use App\Models\Client;
+use App\Models\Organization;
+use App\Models\Project;
+use App\Models\Task;
+use App\Service\ColorService;
+use App\Service\Import\ImportDatabaseHelper;
+use Exception;
+use Illuminate\Database\Eloquent\Builder;
+use League\Csv\Exception as CsvException;
+use League\Csv\Reader;
+
+class ClockifyProjectsImporter implements ImporterContract
+{
+    private Organization $organization;
+
+    /**
+     * @var ImportDatabaseHelper<Project>
+     */
+    private ImportDatabaseHelper $projectImportHelper;
+
+    /**
+     * @var ImportDatabaseHelper<Client>
+     */
+    private ImportDatabaseHelper $clientImportHelper;
+
+    /**
+     * @var ImportDatabaseHelper<Task>
+     */
+    private ImportDatabaseHelper $taskImportHelper;
+
+    #[\Override]
+    public function init(Organization $organization): void
+    {
+        $this->organization = $organization;
+        $this->projectImportHelper = new ImportDatabaseHelper(Project::class, ['name', 'organization_id'], true, function (Builder $builder) {
+            return $builder->where('organization_id', $this->organization->id);
+        });
+        $this->clientImportHelper = new ImportDatabaseHelper(Client::class, ['name', 'organization_id'], true, function (Builder $builder) {
+            return $builder->where('organization_id', $this->organization->id);
+        });
+        $this->taskImportHelper = new ImportDatabaseHelper(Task::class, ['name', 'project_id', 'organization_id'], true, function (Builder $builder) {
+            return $builder->where('organization_id', $this->organization->id);
+        });
+    }
+
+    /**
+     * @throws ImportException
+     */
+    #[\Override]
+    public function importData(string $data): void
+    {
+        try {
+            $colorService = app(ColorService::class);
+            $reader = Reader::createFromString($data);
+            $reader->setHeaderOffset(0);
+            $reader->setDelimiter(',');
+            $header = $reader->getHeader();
+            $this->validateHeader($header);
+            $records = $reader->getRecords();
+            foreach ($records as $record) {
+                $clientId = null;
+                if ($record['Client'] !== '') {
+                    $clientId = $this->clientImportHelper->getKey([
+                        'name' => $record['Client'],
+                        'organization_id' => $this->organization->id,
+                    ]);
+                }
+                $projectId = null;
+                if ($record['Name'] !== '') {
+                    $projectId = $this->projectImportHelper->getKey([
+                        'name' => $record['Name'],
+                        'organization_id' => $this->organization->id,
+                    ], [
+                        'client_id' => $clientId,
+                        'color' => $colorService->getRandomColor(),
+                    ]);
+                }
+
+                if ($record['Tasks'] !== '') {
+                    $tasks = explode(', ', $record['Tasks']);
+                    foreach ($tasks as $task) {
+                        if (strlen($task) > 255) {
+                            throw new ImportException('Task is too long');
+                        }
+                        $taskId = $this->taskImportHelper->getKey([
+                            'name' => $task,
+                            'project_id' => $projectId,
+                            'organization_id' => $this->organization->id,
+                        ]);
+                    }
+                }
+            }
+        } catch (ImportException $exception) {
+            throw $exception;
+        } catch (CsvException $exception) {
+            throw new ImportException('Invalid CSV data');
+        } catch (Exception $exception) {
+            report($exception);
+            throw new ImportException('Unknown error');
+        }
+    }
+
+    /**
+     * @param  array<string>  $header
+     *
+     * @throws ImportException
+     */
+    private function validateHeader(array $header): void
+    {
+        $requiredFields = [
+            'Name',
+            'Client',
+            'Status',
+            'Visibility',
+            'Billability',
+            'Tasks',
+        ];
+        foreach ($requiredFields as $requiredField) {
+            if (! in_array($requiredField, $header, true)) {
+                throw new ImportException('Invalid CSV header, missing field: '.$requiredField);
+            }
+        }
+    }
+
+    #[\Override]
+    public function getReport(): ReportDto
+    {
+        return new ReportDto(
+            clientsCreated: $this->clientImportHelper->getCreatedCount(),
+            projectsCreated: $this->projectImportHelper->getCreatedCount(),
+            tasksCreated: $this->taskImportHelper->getCreatedCount(),
+            timeEntriesCreated: 0,
+            tagsCreated: 0,
+            usersCreated: 0,
+        );
+    }
+}
diff --git a/app/Service/Import/Importers/ClockifyTimeEntriesImporter.php b/app/Service/Import/Importers/ClockifyTimeEntriesImporter.php
new file mode 100644
index 00000000..bb7075cc
--- /dev/null
+++ b/app/Service/Import/Importers/ClockifyTimeEntriesImporter.php
@@ -0,0 +1,227 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Service\Import\Importers;
+
+use App\Models\Client;
+use App\Models\Organization;
+use App\Models\Project;
+use App\Models\Tag;
+use App\Models\Task;
+use App\Models\TimeEntry;
+use App\Models\User;
+use App\Service\ColorService;
+use App\Service\Import\ImportDatabaseHelper;
+use Exception;
+use Illuminate\Database\Eloquent\Builder;
+use Illuminate\Support\Carbon;
+use League\Csv\Exception as CsvException;
+use League\Csv\Reader;
+
+class ClockifyTimeEntriesImporter implements ImporterContract
+{
+    private Organization $organization;
+
+    /**
+     * @var ImportDatabaseHelper<User>
+     */
+    private ImportDatabaseHelper $userImportHelper;
+
+    /**
+     * @var ImportDatabaseHelper<Project>
+     */
+    private ImportDatabaseHelper $projectImportHelper;
+
+    /**
+     * @var ImportDatabaseHelper<Tag>
+     */
+    private ImportDatabaseHelper $tagImportHelper;
+
+    /**
+     * @var ImportDatabaseHelper<Client>
+     */
+    private ImportDatabaseHelper $clientImportHelper;
+
+    /**
+     * @var ImportDatabaseHelper<Task>
+     */
+    private ImportDatabaseHelper $taskImportHelper;
+
+    private int $timeEntriesCreated;
+
+    #[\Override]
+    public function init(Organization $organization): void
+    {
+        $this->organization = $organization;
+        $this->userImportHelper = new ImportDatabaseHelper(User::class, ['email'], true, function (Builder $builder) {
+            /** @var Builder<User> $builder */
+            return $builder->belongsToOrganization($this->organization);
+        }, function (User $user) {
+            $user->organizations()->attach($this->organization, [
+                'role' => 'placeholder',
+            ]);
+        });
+        $this->projectImportHelper = new ImportDatabaseHelper(Project::class, ['name', 'organization_id'], true, function (Builder $builder) {
+            return $builder->where('organization_id', $this->organization->id);
+        });
+        $this->tagImportHelper = new ImportDatabaseHelper(Tag::class, ['name', 'organization_id'], true, function (Builder $builder) {
+            return $builder->where('organization_id', $this->organization->id);
+        });
+        $this->clientImportHelper = new ImportDatabaseHelper(Client::class, ['name', 'organization_id'], true, function (Builder $builder) {
+            return $builder->where('organization_id', $this->organization->id);
+        });
+        $this->taskImportHelper = new ImportDatabaseHelper(Task::class, ['name', 'project_id', 'organization_id'], true, function (Builder $builder) {
+            return $builder->where('organization_id', $this->organization->id);
+        });
+        $this->timeEntriesCreated = 0;
+    }
+
+    /**
+     * @return array<string>
+     *
+     * @throws ImportException
+     */
+    private function getTags(string $tags): array
+    {
+        if (trim($tags) === '') {
+            return [];
+        }
+        $tagsParsed = explode(', ', $tags);
+        $tagIds = [];
+        foreach ($tagsParsed as $tagParsed) {
+            if (strlen($tagParsed) > 255) {
+                throw new ImportException('Tag is too long');
+            }
+            $tagId = $this->tagImportHelper->getKey([
+                'name' => $tagParsed,
+                'organization_id' => $this->organization->id,
+            ]);
+            $tagIds[] = $tagId;
+        }
+
+        return $tagIds;
+    }
+
+    /**
+     * @throws ImportException
+     */
+    #[\Override]
+    public function importData(string $data): void
+    {
+        try {
+            $colorService = app(ColorService::class);
+            $reader = Reader::createFromString($data);
+            $reader->setHeaderOffset(0);
+            $reader->setDelimiter(',');
+            $header = $reader->getHeader();
+            $this->validateHeader($header);
+            $records = $reader->getRecords();
+            foreach ($records as $record) {
+                $userId = $this->userImportHelper->getKey([
+                    'email' => $record['Email'],
+                ], [
+                    'name' => $record['User'],
+                    'is_placeholder' => true,
+                ]);
+                $clientId = null;
+                if ($record['Client'] !== '') {
+                    $clientId = $this->clientImportHelper->getKey([
+                        'name' => $record['Client'],
+                        'organization_id' => $this->organization->id,
+                    ]);
+                }
+                $projectId = null;
+                if ($record['Project'] !== '') {
+                    $projectId = $this->projectImportHelper->getKey([
+                        'name' => $record['Project'],
+                        'organization_id' => $this->organization->id,
+                    ], [
+                        'client_id' => $clientId,
+                        'color' => $colorService->getRandomColor(),
+                    ]);
+                }
+                $taskId = null;
+                if ($record['Task'] !== '') {
+                    $taskId = $this->taskImportHelper->getKey([
+                        'name' => $record['Task'],
+                        'project_id' => $projectId,
+                        'organization_id' => $this->organization->id,
+                    ]);
+                }
+                $timeEntry = new TimeEntry();
+                $timeEntry->user_id = $userId;
+                $timeEntry->task_id = $taskId;
+                $timeEntry->project_id = $projectId;
+                $timeEntry->organization_id = $this->organization->id;
+                $timeEntry->description = $record['Description'];
+                if (! in_array($record['Billable'], ['Yes', 'No'], true)) {
+                    throw new ImportException('Invalid billable value');
+                }
+                $timeEntry->billable = $record['Billable'] === 'Yes';
+                $timeEntry->tags = $this->getTags($record['Tags']);
+                $start = Carbon::createFromFormat('m/d/Y H:i:s A', $record['Start Date'].' '.$record['Start Time'], 'UTC');
+                if ($start === false) {
+                    throw new ImportException('Start date ("'.$record['Start Date'].'") or time ("'.$record['Start Time'].'") are invalid');
+                }
+                $timeEntry->start = $start;
+                $end = Carbon::createFromFormat('m/d/Y H:i:s A', $record['End Date'].' '.$record['End Time'], 'UTC');
+                if ($end === false) {
+                    throw new ImportException('End date ("'.$record['End Date'].'") or time ("'.$record['End Time'].'") are invalid');
+                }
+                $timeEntry->end = $end;
+                $timeEntry->save();
+                $this->timeEntriesCreated++;
+            }
+        } catch (ImportException $exception) {
+            throw $exception;
+        } catch (CsvException $exception) {
+            throw new ImportException('Invalid CSV data');
+        } catch (Exception $exception) {
+            report($exception);
+            throw new ImportException('Unknown error');
+        }
+    }
+
+    /**
+     * @param  array<string>  $header
+     *
+     * @throws ImportException
+     */
+    private function validateHeader(array $header): void
+    {
+        $requiredFields = [
+            'Project',
+            'Client',
+            'Description',
+            'Task',
+            'User',
+            'Group',
+            'Email',
+            'Tags',
+            'Billable',
+            'Start Date',
+            'Start Time',
+            'End Date',
+            'End Time',
+        ];
+        foreach ($requiredFields as $requiredField) {
+            if (! in_array($requiredField, $header, true)) {
+                throw new ImportException('Invalid CSV header, missing field: '.$requiredField);
+            }
+        }
+    }
+
+    #[\Override]
+    public function getReport(): ReportDto
+    {
+        return new ReportDto(
+            clientsCreated: $this->clientImportHelper->getCreatedCount(),
+            projectsCreated: $this->projectImportHelper->getCreatedCount(),
+            tasksCreated: $this->taskImportHelper->getCreatedCount(),
+            timeEntriesCreated: $this->timeEntriesCreated,
+            tagsCreated: $this->tagImportHelper->getCreatedCount(),
+            usersCreated: $this->userImportHelper->getCreatedCount(),
+        );
+    }
+}
diff --git a/app/Service/Import/Importers/ImporterContract.php b/app/Service/Import/Importers/ImporterContract.php
index 65ca1bb6..a4846167 100644
--- a/app/Service/Import/Importers/ImporterContract.php
+++ b/app/Service/Import/Importers/ImporterContract.php
@@ -10,7 +10,7 @@ interface ImporterContract
 {
     public function init(Organization $organization): void;
 
-    public function importData(string $data, array $options): void;
+    public function importData(string $data): void;
 
     public function getReport(): ReportDto;
 }
diff --git a/app/Service/Import/Importers/ImporterProvider.php b/app/Service/Import/Importers/ImporterProvider.php
index ed413566..56eacf08 100644
--- a/app/Service/Import/Importers/ImporterProvider.php
+++ b/app/Service/Import/Importers/ImporterProvider.php
@@ -11,6 +11,9 @@ class ImporterProvider
      */
     private array $importers = [
         'toggl_time_entries' => TogglTimeEntriesImporter::class,
+        'toggl_data_importer' => TogglDataImporter::class,
+        'clockify_time_entries' => ClockifyTimeEntriesImporter::class,
+        'clockify_projects' => ClockifyProjectsImporter::class,
     ];
 
     /**
diff --git a/app/Service/Import/Importers/TogglDataImporter.php b/app/Service/Import/Importers/TogglDataImporter.php
new file mode 100644
index 00000000..2183b2d9
--- /dev/null
+++ b/app/Service/Import/Importers/TogglDataImporter.php
@@ -0,0 +1,194 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Service\Import\Importers;
+
+use App\Models\Client;
+use App\Models\Organization;
+use App\Models\Project;
+use App\Models\Tag;
+use App\Models\Task;
+use App\Models\User;
+use App\Service\ColorService;
+use App\Service\Import\ImportDatabaseHelper;
+use Exception;
+use Illuminate\Database\Eloquent\Builder;
+use Spatie\TemporaryDirectory\TemporaryDirectory;
+use ZipArchive;
+
+class TogglDataImporter implements ImporterContract
+{
+    private Organization $organization;
+
+    /**
+     * @var ImportDatabaseHelper<User>
+     */
+    private ImportDatabaseHelper $userImportHelper;
+
+    /**
+     * @var ImportDatabaseHelper<Project>
+     */
+    private ImportDatabaseHelper $projectImportHelper;
+
+    /**
+     * @var ImportDatabaseHelper<Tag>
+     */
+    private ImportDatabaseHelper $tagImportHelper;
+
+    /**
+     * @var ImportDatabaseHelper<Client>
+     */
+    private ImportDatabaseHelper $clientImportHelper;
+
+    /**
+     * @var ImportDatabaseHelper<Task>
+     */
+    private ImportDatabaseHelper $taskImportHelper;
+
+    private ColorService $colorService;
+
+    #[\Override]
+    public function init(Organization $organization): void
+    {
+        $this->organization = $organization;
+        $this->userImportHelper = new ImportDatabaseHelper(User::class, ['email'], true, function (Builder $builder) {
+            /** @var Builder<User> $builder */
+            return $builder->belongsToOrganization($this->organization);
+        }, function (User $user) {
+            $user->organizations()->attach($this->organization, [
+                'role' => 'placeholder',
+            ]);
+        });
+        $this->projectImportHelper = new ImportDatabaseHelper(Project::class, ['name', 'organization_id'], true, function (Builder $builder) {
+            return $builder->where('organization_id', $this->organization->id);
+        });
+        $this->tagImportHelper = new ImportDatabaseHelper(Tag::class, ['name', 'organization_id'], true, function (Builder $builder) {
+            return $builder->where('organization_id', $this->organization->id);
+        });
+        $this->clientImportHelper = new ImportDatabaseHelper(Client::class, ['name', 'organization_id'], true, function (Builder $builder) {
+            return $builder->where('organization_id', $this->organization->id);
+        });
+        $this->taskImportHelper = new ImportDatabaseHelper(Task::class, ['name', 'project_id', 'organization_id'], true, function (Builder $builder) {
+            return $builder->where('organization_id', $this->organization->id);
+        });
+        $this->colorService = app(ColorService::class);
+    }
+
+    /**
+     * @throws ImportException
+     */
+    #[\Override]
+    public function importData(string $data): void
+    {
+        try {
+            $zip = new ZipArchive();
+            $temporaryDirectory = TemporaryDirectory::make();
+            file_put_contents($temporaryDirectory->path('import.zip'), $data);
+            $zip->open($temporaryDirectory->path('import.zip'), ZipArchive::RDONLY);
+            $temporaryDirectory = TemporaryDirectory::make();
+            $zip->extractTo($temporaryDirectory->path());
+            $zip->close();
+            $clientsFileContent = file_get_contents($temporaryDirectory->path('clients.json'));
+            if ($clientsFileContent === false) {
+                throw new ImportException('File clients.json missing in ZIP');
+            }
+            $clients = json_decode($clientsFileContent);
+            $projectsFileContent = file_get_contents($temporaryDirectory->path('projects.json'));
+            if ($projectsFileContent === false) {
+                throw new ImportException('File projects.json missing in ZIP');
+            }
+            $projects = json_decode($projectsFileContent);
+            $tagsFileContent = file_get_contents($temporaryDirectory->path('tags.json'));
+            if ($tagsFileContent === false) {
+                throw new ImportException('File tags.json missing in ZIP');
+            }
+            $tags = json_decode($tagsFileContent);
+            $workspaceUsersFileContent = file_get_contents($temporaryDirectory->path('workspace_users.json'));
+            if ($workspaceUsersFileContent === false) {
+                throw new ImportException('File workspace_users.json missing in ZIP');
+            }
+            $workspaceUsers = json_decode($workspaceUsersFileContent);
+            foreach ($clients as $client) {
+                $this->clientImportHelper->getKey([
+                    'name' => $client->name,
+                    'organization_id' => $this->organization->id,
+                ], [], (string) $client->id);
+            }
+            foreach ($tags as $tag) {
+                $this->tagImportHelper->getKey([
+                    'name' => $tag->name,
+                    'organization_id' => $this->organization->id,
+                ], [], (string) $tag->id);
+            }
+
+            foreach ($projects as $project) {
+                $clientId = null;
+                if ($project->client_id !== null) {
+                    $clientId = $this->clientImportHelper->getKeyByExternalIdentifier((string) $project->client_id);
+                    if ($clientId === null) {
+                        throw new Exception('Client does not exist');
+                    }
+                }
+
+                if (! $this->colorService->isValid($project->color)) {
+                    throw new ImportException('Invalid color');
+                }
+
+                $this->projectImportHelper->getKey([
+                    'name' => $project->name,
+                    'organization_id' => $this->organization->getKey(),
+                ], [
+                    'client_id' => $clientId,
+                    'color' => $project->color,
+                ], (string) $project->id);
+            }
+            foreach ($workspaceUsers as $workspaceUser) {
+                $this->userImportHelper->getKey([
+                    'email' => $workspaceUser->email,
+                ], [
+                    'name' => $workspaceUser->name,
+                    'is_placeholder' => true,
+                ], (string) $workspaceUser->id);
+            }
+            $projectIds = $this->projectImportHelper->getExternalIds();
+            foreach ($projectIds as $projectIdExternal) {
+                $tasksFileContent = file_get_contents($temporaryDirectory->path('tasks/'.$projectIdExternal.'.json'));
+                if ($tasksFileContent === false) {
+                    throw new ImportException('File tasks/'.$projectIdExternal.'.json missing in ZIP');
+                }
+                $tasks = json_decode($tasksFileContent);
+                foreach ($tasks as $task) {
+                    $projectId = $this->projectImportHelper->getKeyByExternalIdentifier((string) $projectIdExternal);
+
+                    if ($projectId === null) {
+                        throw new Exception('Project does not exist');
+                    }
+                    $this->taskImportHelper->getKey([
+                        'name' => $task->name,
+                        'project_id' => $projectId,
+                        'organization_id' => $this->organization->getKey(),
+                    ], [], (string) $task->id);
+                }
+            }
+        } catch (ImportException $exception) {
+            throw $exception;
+        } catch (Exception $exception) {
+            report($exception);
+            throw new ImportException('Unknown error');
+        }
+    }
+
+    #[\Override]
+    public function getReport(): ReportDto
+    {
+        return new ReportDto(
+            clientsCreated: $this->clientImportHelper->getCreatedCount(),
+            projectsCreated: $this->projectImportHelper->getCreatedCount(),
+            tasksCreated: $this->taskImportHelper->getCreatedCount(),
+            timeEntriesCreated: 0,
+            tagsCreated: $this->tagImportHelper->getCreatedCount(),
+            usersCreated: $this->userImportHelper->getCreatedCount(),
+        );
+    }
+}
diff --git a/app/Service/Import/Importers/TogglTimeEntriesImporter.php b/app/Service/Import/Importers/TogglTimeEntriesImporter.php
index 0021bfb6..74740496 100644
--- a/app/Service/Import/Importers/TogglTimeEntriesImporter.php
+++ b/app/Service/Import/Importers/TogglTimeEntriesImporter.php
@@ -13,6 +13,7 @@ use App\Models\TimeEntry;
 use App\Models\User;
 use App\Service\ColorService;
 use App\Service\Import\ImportDatabaseHelper;
+use Exception;
 use Illuminate\Database\Eloquent\Builder;
 use Illuminate\Support\Carbon;
 use League\Csv\Exception as CsvException;
@@ -22,14 +23,29 @@ class TogglTimeEntriesImporter implements ImporterContract
 {
     private Organization $organization;
 
+    /**
+     * @var ImportDatabaseHelper<User>
+     */
     private ImportDatabaseHelper $userImportHelper;
 
+    /**
+     * @var ImportDatabaseHelper<Project>
+     */
     private ImportDatabaseHelper $projectImportHelper;
 
+    /**
+     * @var ImportDatabaseHelper<Tag>
+     */
     private ImportDatabaseHelper $tagImportHelper;
 
+    /**
+     * @var ImportDatabaseHelper<Client>
+     */
     private ImportDatabaseHelper $clientImportHelper;
 
+    /**
+     * @var ImportDatabaseHelper<Task>
+     */
     private ImportDatabaseHelper $taskImportHelper;
 
     private int $timeEntriesCreated;
@@ -39,14 +55,13 @@ class TogglTimeEntriesImporter implements ImporterContract
     {
         $this->organization = $organization;
         $this->userImportHelper = new ImportDatabaseHelper(User::class, ['email'], true, function (Builder $builder) {
-            return $builder->whereHas('organizations', function (Builder $builder): Builder {
-                /** @var Builder<Organization> $builder */
-                return $builder->whereKey($this->organization->getKey());
-            });
+            /** @var Builder<User> $builder */
+            return $builder->belongsToOrganization($this->organization);
         }, function (User $user) {
-            $user->organizations()->attach([$this->organization->id]);
+            $user->organizations()->attach($this->organization, [
+                'role' => 'placeholder',
+            ]);
         });
-        // TODO: user special after import
         $this->projectImportHelper = new ImportDatabaseHelper(Project::class, ['name', 'organization_id'], true, function (Builder $builder) {
             return $builder->where('organization_id', $this->organization->id);
         });
@@ -62,6 +77,11 @@ class TogglTimeEntriesImporter implements ImporterContract
         $this->timeEntriesCreated = 0;
     }
 
+    /**
+     * @return array<string>
+     *
+     * @throws ImportException
+     */
     private function getTags(string $tags): array
     {
         if (trim($tags) === '') {
@@ -87,7 +107,7 @@ class TogglTimeEntriesImporter implements ImporterContract
      * @throws ImportException
      */
     #[\Override]
-    public function importData(string $data, array $options): void
+    public function importData(string $data): void
     {
         try {
             $colorService = app(ColorService::class);
@@ -140,17 +160,34 @@ class TogglTimeEntriesImporter implements ImporterContract
                 }
                 $timeEntry->billable = $record['Billable'] === 'Yes';
                 $timeEntry->tags = $this->getTags($record['Tags']);
-                $timeEntry->start = Carbon::createFromFormat('Y-m-d H:i:s', $record['Start date'].' '.$record['Start time'], 'UTC');
-                $timeEntry->end = Carbon::createFromFormat('Y-m-d H:i:s', $record['End date'].' '.$record['End time'], 'UTC');
+                $start = Carbon::createFromFormat('Y-m-d H:i:s', $record['Start date'].' '.$record['Start time'], 'UTC');
+                if ($start === false) {
+                    throw new ImportException('Start date ("'.$record['Start date'].'") or time ("'.$record['Start time'].'") are invalid');
+                }
+                $timeEntry->start = $start;
+                $end = Carbon::createFromFormat('Y-m-d H:i:s', $record['End date'].' '.$record['End time'], 'UTC');
+                if ($end === false) {
+                    throw new ImportException('End date ("'.$record['End date'].'") or time ("'.$record['End time'].'") are invalid');
+                }
+                $timeEntry->end = $end;
                 $timeEntry->save();
                 $this->timeEntriesCreated++;
             }
+        } catch (ImportException $exception) {
+            throw $exception;
         } catch (CsvException $exception) {
             throw new ImportException('Invalid CSV data');
+        } catch (Exception $exception) {
+            report($exception);
+            throw new ImportException('Unknown error');
         }
-
     }
 
+    /**
+     * @param  array<string>  $header
+     *
+     * @throws ImportException
+     */
     private function validateHeader(array $header): void
     {
         $requiredFields = [
diff --git a/app/Service/UserService.php b/app/Service/UserService.php
index e554e078..87be9978 100644
--- a/app/Service/UserService.php
+++ b/app/Service/UserService.php
@@ -13,11 +13,11 @@ class UserService
     public function assignOrganizationEntitiesToDifferentUser(Organization $organization, User $fromUser, User $toUser): void
     {
         // Time entries
-        dump(TimeEntry::query()
+        TimeEntry::query()
             ->whereBelongsTo($organization, 'organization')
             ->whereBelongsTo($fromUser, 'user')
             ->update([
                 'user_id' => $toUser->getKey(),
-            ]));
+            ]);
     }
 }
diff --git a/composer.json b/composer.json
index 8b895a38..8b84fdf8 100644
--- a/composer.json
+++ b/composer.json
@@ -6,6 +6,7 @@
     "license": "AGPL-3.0-or-later",
     "require": {
         "php": "8.3.*",
+        "ext-zip": "*",
         "dedoc/scramble": "^0.8.5",
         "filament/filament": "^3.2",
         "guzzlehttp/guzzle": "^7.2",
@@ -16,6 +17,7 @@
         "laravel/passport": "^11.10.2",
         "laravel/tinker": "^2.8",
         "pxlrbt/filament-environment-indicator": "^2.0",
+        "spatie/temporary-directory": "^2.2",
         "tightenco/ziggy": "^1.0",
         "tpetry/laravel-postgresql-enhanced": "^0.33.0"
     },
diff --git a/composer.lock b/composer.lock
index d39541ae..f3065194 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "e83929e68d256367652d91e43a79288e",
+    "content-hash": "9e9c41ae5787e1aa711b04cc019cb7e7",
     "packages": [
         {
             "name": "anourvalar/eloquent-serialize",
@@ -6542,6 +6542,67 @@
             ],
             "time": "2024-01-11T08:43:00+00:00"
         },
+        {
+            "name": "spatie/temporary-directory",
+            "version": "2.2.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/spatie/temporary-directory.git",
+                "reference": "76949fa18f8e1a7f663fd2eaa1d00e0bcea0752a"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/spatie/temporary-directory/zipball/76949fa18f8e1a7f663fd2eaa1d00e0bcea0752a",
+                "reference": "76949fa18f8e1a7f663fd2eaa1d00e0bcea0752a",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^8.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^9.5"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "Spatie\\TemporaryDirectory\\": "src"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Alex Vanderbist",
+                    "email": "alex@spatie.be",
+                    "homepage": "https://spatie.be",
+                    "role": "Developer"
+                }
+            ],
+            "description": "Easily create, use and destroy temporary directories",
+            "homepage": "https://github.com/spatie/temporary-directory",
+            "keywords": [
+                "php",
+                "spatie",
+                "temporary-directory"
+            ],
+            "support": {
+                "issues": "https://github.com/spatie/temporary-directory/issues",
+                "source": "https://github.com/spatie/temporary-directory/tree/2.2.1"
+            },
+            "funding": [
+                {
+                    "url": "https://spatie.be/open-source/support-us",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/spatie",
+                    "type": "github"
+                }
+            ],
+            "time": "2023-12-25T11:46:58+00:00"
+        },
         {
             "name": "symfony/console",
             "version": "v6.4.4",
@@ -12424,7 +12485,8 @@
     "prefer-stable": true,
     "prefer-lowest": false,
     "platform": {
-        "php": "8.3.*"
+        "php": "8.3.*",
+        "ext-zip": "*"
     },
     "platform-dev": [],
     "plugin-api-version": "2.6.0"
diff --git a/config/filesystems.php b/config/filesystems.php
index d307268d..508cc76c 100644
--- a/config/filesystems.php
+++ b/config/filesystems.php
@@ -58,6 +58,12 @@ return [
             'throw' => false,
         ],
 
+        'testfiles' => [
+            'driver' => 'local',
+            'root' => storage_path('tests'),
+            'throw' => false,
+        ],
+
     ],
 
     /*
diff --git a/database/factories/ProjectFactory.php b/database/factories/ProjectFactory.php
index c05a79ff..f8654731 100644
--- a/database/factories/ProjectFactory.php
+++ b/database/factories/ProjectFactory.php
@@ -7,6 +7,7 @@ namespace Database\Factories;
 use App\Models\Client;
 use App\Models\Organization;
 use App\Models\Project;
+use App\Service\ColorService;
 use Illuminate\Database\Eloquent\Factories\Factory;
 
 /**
@@ -23,7 +24,7 @@ class ProjectFactory extends Factory
     {
         return [
             'name' => $this->faker->company(),
-            'color' => $this->faker->hexColor(),
+            'color' => app(ColorService::class)->getRandomColor(),
             'organization_id' => Organization::factory(),
             'client_id' => null,
         ];
diff --git a/lang/en/auth.php b/lang/en/auth.php
new file mode 100644
index 00000000..e2de2aca
--- /dev/null
+++ b/lang/en/auth.php
@@ -0,0 +1,22 @@
+<?php
+
+declare(strict_types=1);
+
+return [
+
+    /*
+    |--------------------------------------------------------------------------
+    | Authentication Language Lines
+    |--------------------------------------------------------------------------
+    |
+    | The following language lines are used during authentication for various
+    | messages that we need to display to the user. You are free to modify
+    | these language lines according to your application's requirements.
+    |
+    */
+
+    'failed' => 'These credentials do not match our records.',
+    'password' => 'The provided password is incorrect.',
+    'throttle' => 'Too many login attempts. Please try again in :seconds seconds.',
+
+];
diff --git a/lang/en/pagination.php b/lang/en/pagination.php
new file mode 100644
index 00000000..f03c42c6
--- /dev/null
+++ b/lang/en/pagination.php
@@ -0,0 +1,21 @@
+<?php
+
+declare(strict_types=1);
+
+return [
+
+    /*
+    |--------------------------------------------------------------------------
+    | Pagination Language Lines
+    |--------------------------------------------------------------------------
+    |
+    | The following language lines are used by the paginator library to build
+    | the simple pagination links. You are free to change them to anything
+    | you want to customize your views to better match your application.
+    |
+    */
+
+    'previous' => '&laquo; Previous',
+    'next' => 'Next &raquo;',
+
+];
diff --git a/lang/en/passwords.php b/lang/en/passwords.php
new file mode 100644
index 00000000..43092321
--- /dev/null
+++ b/lang/en/passwords.php
@@ -0,0 +1,24 @@
+<?php
+
+declare(strict_types=1);
+
+return [
+
+    /*
+    |--------------------------------------------------------------------------
+    | Password Reset Language Lines
+    |--------------------------------------------------------------------------
+    |
+    | The following language lines are the default lines which match reasons
+    | that are given by the password broker for a password update attempt
+    | has failed, such as for an invalid token or invalid new password.
+    |
+    */
+
+    'reset' => 'Your password has been reset.',
+    'sent' => 'We have emailed your password reset link.',
+    'throttled' => 'Please wait before retrying.',
+    'token' => 'This password reset token is invalid.',
+    'user' => "We can't find a user with that email address.",
+
+];
diff --git a/lang/en/validation.php b/lang/en/validation.php
new file mode 100644
index 00000000..9813d38a
--- /dev/null
+++ b/lang/en/validation.php
@@ -0,0 +1,199 @@
+<?php
+
+declare(strict_types=1);
+
+return [
+
+    /*
+    |--------------------------------------------------------------------------
+    | Validation Language Lines
+    |--------------------------------------------------------------------------
+    |
+    | The following language lines contain the default error messages used by
+    | the validator class. Some of these rules have multiple versions such
+    | as the size rules. Feel free to tweak each of these messages here.
+    |
+    */
+
+    'accepted' => 'The :attribute field must be accepted.',
+    'accepted_if' => 'The :attribute field must be accepted when :other is :value.',
+    'active_url' => 'The :attribute field must be a valid URL.',
+    'after' => 'The :attribute field must be a date after :date.',
+    'after_or_equal' => 'The :attribute field must be a date after or equal to :date.',
+    'alpha' => 'The :attribute field must only contain letters.',
+    'alpha_dash' => 'The :attribute field must only contain letters, numbers, dashes, and underscores.',
+    'alpha_num' => 'The :attribute field must only contain letters and numbers.',
+    'array' => 'The :attribute field must be an array.',
+    'ascii' => 'The :attribute field must only contain single-byte alphanumeric characters and symbols.',
+    'before' => 'The :attribute field must be a date before :date.',
+    'before_or_equal' => 'The :attribute field must be a date before or equal to :date.',
+    'between' => [
+        'array' => 'The :attribute field must have between :min and :max items.',
+        'file' => 'The :attribute field must be between :min and :max kilobytes.',
+        'numeric' => 'The :attribute field must be between :min and :max.',
+        'string' => 'The :attribute field must be between :min and :max characters.',
+    ],
+    'boolean' => 'The :attribute field must be true or false.',
+    'can' => 'The :attribute field contains an unauthorized value.',
+    'confirmed' => 'The :attribute field confirmation does not match.',
+    'current_password' => 'The password is incorrect.',
+    'date' => 'The :attribute field must be a valid date.',
+    'date_equals' => 'The :attribute field must be a date equal to :date.',
+    'date_format' => 'The :attribute field must match the format :format.',
+    'decimal' => 'The :attribute field must have :decimal decimal places.',
+    'declined' => 'The :attribute field must be declined.',
+    'declined_if' => 'The :attribute field must be declined when :other is :value.',
+    'different' => 'The :attribute field and :other must be different.',
+    'digits' => 'The :attribute field must be :digits digits.',
+    'digits_between' => 'The :attribute field must be between :min and :max digits.',
+    'dimensions' => 'The :attribute field has invalid image dimensions.',
+    'distinct' => 'The :attribute field has a duplicate value.',
+    'doesnt_end_with' => 'The :attribute field must not end with one of the following: :values.',
+    'doesnt_start_with' => 'The :attribute field must not start with one of the following: :values.',
+    'email' => 'The :attribute field must be a valid email address.',
+    'ends_with' => 'The :attribute field must end with one of the following: :values.',
+    'enum' => 'The selected :attribute is invalid.',
+    'exists' => 'The selected :attribute is invalid.',
+    'extensions' => 'The :attribute field must have one of the following extensions: :values.',
+    'file' => 'The :attribute field must be a file.',
+    'filled' => 'The :attribute field must have a value.',
+    'gt' => [
+        'array' => 'The :attribute field must have more than :value items.',
+        'file' => 'The :attribute field must be greater than :value kilobytes.',
+        'numeric' => 'The :attribute field must be greater than :value.',
+        'string' => 'The :attribute field must be greater than :value characters.',
+    ],
+    'gte' => [
+        'array' => 'The :attribute field must have :value items or more.',
+        'file' => 'The :attribute field must be greater than or equal to :value kilobytes.',
+        'numeric' => 'The :attribute field must be greater than or equal to :value.',
+        'string' => 'The :attribute field must be greater than or equal to :value characters.',
+    ],
+    'hex_color' => 'The :attribute field must be a valid hexadecimal color.',
+    'image' => 'The :attribute field must be an image.',
+    'in' => 'The selected :attribute is invalid.',
+    'in_array' => 'The :attribute field must exist in :other.',
+    'integer' => 'The :attribute field must be an integer.',
+    'ip' => 'The :attribute field must be a valid IP address.',
+    'ipv4' => 'The :attribute field must be a valid IPv4 address.',
+    'ipv6' => 'The :attribute field must be a valid IPv6 address.',
+    'json' => 'The :attribute field must be a valid JSON string.',
+    'lowercase' => 'The :attribute field must be lowercase.',
+    'lt' => [
+        'array' => 'The :attribute field must have less than :value items.',
+        'file' => 'The :attribute field must be less than :value kilobytes.',
+        'numeric' => 'The :attribute field must be less than :value.',
+        'string' => 'The :attribute field must be less than :value characters.',
+    ],
+    'lte' => [
+        'array' => 'The :attribute field must not have more than :value items.',
+        'file' => 'The :attribute field must be less than or equal to :value kilobytes.',
+        'numeric' => 'The :attribute field must be less than or equal to :value.',
+        'string' => 'The :attribute field must be less than or equal to :value characters.',
+    ],
+    'mac_address' => 'The :attribute field must be a valid MAC address.',
+    'max' => [
+        'array' => 'The :attribute field must not have more than :max items.',
+        'file' => 'The :attribute field must not be greater than :max kilobytes.',
+        'numeric' => 'The :attribute field must not be greater than :max.',
+        'string' => 'The :attribute field must not be greater than :max characters.',
+    ],
+    'max_digits' => 'The :attribute field must not have more than :max digits.',
+    'mimes' => 'The :attribute field must be a file of type: :values.',
+    'mimetypes' => 'The :attribute field must be a file of type: :values.',
+    'min' => [
+        'array' => 'The :attribute field must have at least :min items.',
+        'file' => 'The :attribute field must be at least :min kilobytes.',
+        'numeric' => 'The :attribute field must be at least :min.',
+        'string' => 'The :attribute field must be at least :min characters.',
+    ],
+    'min_digits' => 'The :attribute field must have at least :min digits.',
+    'missing' => 'The :attribute field must be missing.',
+    'missing_if' => 'The :attribute field must be missing when :other is :value.',
+    'missing_unless' => 'The :attribute field must be missing unless :other is :value.',
+    'missing_with' => 'The :attribute field must be missing when :values is present.',
+    'missing_with_all' => 'The :attribute field must be missing when :values are present.',
+    'multiple_of' => 'The :attribute field must be a multiple of :value.',
+    'not_in' => 'The selected :attribute is invalid.',
+    'not_regex' => 'The :attribute field format is invalid.',
+    'numeric' => 'The :attribute field must be a number.',
+    'password' => [
+        'letters' => 'The :attribute field must contain at least one letter.',
+        'mixed' => 'The :attribute field must contain at least one uppercase and one lowercase letter.',
+        'numbers' => 'The :attribute field must contain at least one number.',
+        'symbols' => 'The :attribute field must contain at least one symbol.',
+        'uncompromised' => 'The given :attribute has appeared in a data leak. Please choose a different :attribute.',
+    ],
+    'present' => 'The :attribute field must be present.',
+    'present_if' => 'The :attribute field must be present when :other is :value.',
+    'present_unless' => 'The :attribute field must be present unless :other is :value.',
+    'present_with' => 'The :attribute field must be present when :values is present.',
+    'present_with_all' => 'The :attribute field must be present when :values are present.',
+    'prohibited' => 'The :attribute field is prohibited.',
+    'prohibited_if' => 'The :attribute field is prohibited when :other is :value.',
+    'prohibited_unless' => 'The :attribute field is prohibited unless :other is in :values.',
+    'prohibits' => 'The :attribute field prohibits :other from being present.',
+    'regex' => 'The :attribute field format is invalid.',
+    'required' => 'The :attribute field is required.',
+    'required_array_keys' => 'The :attribute field must contain entries for: :values.',
+    'required_if' => 'The :attribute field is required when :other is :value.',
+    'required_if_accepted' => 'The :attribute field is required when :other is accepted.',
+    'required_unless' => 'The :attribute field is required unless :other is in :values.',
+    'required_with' => 'The :attribute field is required when :values is present.',
+    'required_with_all' => 'The :attribute field is required when :values are present.',
+    'required_without' => 'The :attribute field is required when :values is not present.',
+    'required_without_all' => 'The :attribute field is required when none of :values are present.',
+    'same' => 'The :attribute field must match :other.',
+    'size' => [
+        'array' => 'The :attribute field must contain :size items.',
+        'file' => 'The :attribute field must be :size kilobytes.',
+        'numeric' => 'The :attribute field must be :size.',
+        'string' => 'The :attribute field must be :size characters.',
+    ],
+    'starts_with' => 'The :attribute field must start with one of the following: :values.',
+    'string' => 'The :attribute field must be a string.',
+    'timezone' => 'The :attribute field must be a valid timezone.',
+    'unique' => 'The :attribute has already been taken.',
+    'uploaded' => 'The :attribute failed to upload.',
+    'uppercase' => 'The :attribute field must be uppercase.',
+    'url' => 'The :attribute field must be a valid URL.',
+    'ulid' => 'The :attribute field must be a valid ULID.',
+    'uuid' => 'The :attribute field must be a valid UUID.',
+
+    /*
+    |--------------------------------------------------------------------------
+    | Custom Validation Language Lines
+    |--------------------------------------------------------------------------
+    |
+    | Here you may specify custom validation messages for attributes using the
+    | convention "attribute.rule" to name the lines. This makes it quick to
+    | specify a specific custom language line for a given attribute rule.
+    |
+    */
+
+    'custom' => [
+        'attribute-name' => [
+            'rule-name' => 'custom-message',
+        ],
+    ],
+
+    /*
+    |--------------------------------------------------------------------------
+    | Custom Validation Attributes
+    |--------------------------------------------------------------------------
+    |
+    | The following language lines are used to swap our attribute placeholder
+    | with something more reader friendly such as "E-Mail Address" instead
+    | of "email". This simply helps us make our message more expressive.
+    |
+    */
+
+    'attributes' => [],
+
+    /*
+     * Custom validation rules
+     */
+
+    'color' => 'The :attribute field must be a valid color.',
+
+];
diff --git a/storage/tests/clockify_import_test_1.csv b/storage/tests/clockify_import_test_1.csv
deleted file mode 100644
index 66b59c18..00000000
--- a/storage/tests/clockify_import_test_1.csv
+++ /dev/null
@@ -1 +0,0 @@
-"Project","Client","Description","Task","User","Group","Email","Tags","Billable","Start Date","Start Time","End Date","End Time","Duration (h)","Duration (decimal)","Billable Rate (USD)","Billable Amount (USD)"
diff --git a/storage/tests/clockify_projects_import_test_1.csv b/storage/tests/clockify_projects_import_test_1.csv
new file mode 100644
index 00000000..d8c018fb
--- /dev/null
+++ b/storage/tests/clockify_projects_import_test_1.csv
@@ -0,0 +1,3 @@
+"Name","Client","Status","Visibility","Billability","Tasks","Tracked (h)","Estimated (h)","Remaining (h)","Overage (h)","Progress(%)","Billable (h)","Non-billable (h)","Billable Rate (USD)","Amount (USD)","Project members","Project manager","Note"
+"Project for Big Company","Big Company","Active","Public","Yes","Task 1, Task 2, Task 3","0.00","","","","","0.00","0.00","","0.00","Constantin Graf","",""
+"Project without Client","","Active","Public","Yes","","0.00","","","","","0.00","0.00","","0.00","Constantin Graf","",""
diff --git a/storage/tests/clockify_time_entries_import_test_1.csv b/storage/tests/clockify_time_entries_import_test_1.csv
new file mode 100644
index 00000000..b7b1f1ce
--- /dev/null
+++ b/storage/tests/clockify_time_entries_import_test_1.csv
@@ -0,0 +1,3 @@
+"Project","Client","Description","Task","User","Group","Email","Tags","Billable","Start Date","Start Time","End Date","End Time","Duration (h)","Duration (decimal)","Billable Rate (USD)","Billable Amount (USD)"
+"Project without Client","","","","Peter Tester","","peter.test@email.test","Development, Backend","No","03/04/2024","10:23:52 AM","03/04/2024","10:23:52 AM","00:00:00","0.00","0.00","0.00"
+"Project for Big Company","Big Company","Working hard","Task 1","Peter Tester","","peter.test@email.test","","Yes","03/04/2024","10:23:00 AM","03/04/2024","11:23:01 AM","01:00:01","0.00","0.00","0.00"
diff --git a/storage/tests/toggl_data_import_test_1/clients.json b/storage/tests/toggl_data_import_test_1/clients.json
new file mode 100644
index 00000000..9291eaef
--- /dev/null
+++ b/storage/tests/toggl_data_import_test_1/clients.json
@@ -0,0 +1,9 @@
+[
+    {
+        "archived": false,
+        "creator_id": 201,
+        "id": 301,
+        "name": "Big Company",
+        "wid": 0
+    }
+]
diff --git a/storage/tests/toggl_data_import_test_1/projects.json b/storage/tests/toggl_data_import_test_1/projects.json
new file mode 100644
index 00000000..7c28f2d7
--- /dev/null
+++ b/storage/tests/toggl_data_import_test_1/projects.json
@@ -0,0 +1,58 @@
+[
+    {
+        "active": true,
+        "actual_hours": null,
+        "actual_seconds": null,
+        "auto_estimates": false,
+        "billable": true,
+        "cid": null,
+        "client_id": null,
+        "color": "#ef5350",
+        "currency": "EUR",
+        "estimated_hours": null,
+        "estimated_seconds": null,
+        "fixed_fee": null,
+        "guid": "",
+        "id": 401,
+        "is_private": true,
+        "name": "Project without Client",
+        "rate": null,
+        "rate_last_updated": null,
+        "recurring": false,
+        "recurring_parameters": null,
+        "start_date": "2020-01-01",
+        "status": "active",
+        "template": false,
+        "template_id": null,
+        "wid": 0,
+        "workspace_id": 0
+    },
+    {
+        "active": true,
+        "actual_hours": null,
+        "actual_seconds": null,
+        "auto_estimates": false,
+        "billable": false,
+        "cid": 301,
+        "client_id": 301,
+        "color": "#ec407a",
+        "currency": null,
+        "estimated_hours": null,
+        "estimated_seconds": null,
+        "fixed_fee": null,
+        "guid": "",
+        "id": 402,
+        "is_private": true,
+        "name": "Project for Big Company",
+        "rate": null,
+        "rate_last_updated": null,
+        "recurring": false,
+        "recurring_parameters": null,
+        "start_date": "2020-01-01",
+        "status": "active",
+        "template": false,
+        "template_id": null,
+        "wid": 0,
+        "workspace_id": 0
+    }
+]
diff --git a/storage/tests/toggl_data_import_test_1/tags.json b/storage/tests/toggl_data_import_test_1/tags.json
new file mode 100644
index 00000000..4bc90b57
--- /dev/null
+++ b/storage/tests/toggl_data_import_test_1/tags.json
@@ -0,0 +1,14 @@
+[
+    {
+        "creator_id": 0,
+        "id": 501,
+        "name": "Development",
+        "workspace_id": 0
+    },
+    {
+        "creator_id": 0,
+        "id": 502,
+        "name": "Backend",
+        "workspace_id": 0
+    }
+]
diff --git a/storage/tests/toggl_data_import_test_1/tasks/401.json b/storage/tests/toggl_data_import_test_1/tasks/401.json
new file mode 100644
index 00000000..fe51488c
--- /dev/null
+++ b/storage/tests/toggl_data_import_test_1/tasks/401.json
@@ -0,0 +1 @@
+[]
diff --git a/storage/tests/toggl_data_import_test_1/tasks/402.json b/storage/tests/toggl_data_import_test_1/tasks/402.json
new file mode 100644
index 00000000..fc7d6934
--- /dev/null
+++ b/storage/tests/toggl_data_import_test_1/tasks/402.json
@@ -0,0 +1,13 @@
+[
+    {
+        "active": true,
+        "estimated_seconds": 0,
+        "id": 601,
+        "name": "Task 1",
+        "project_id": 402,
+        "recurring": false,
+        "tracked_seconds": 0,
+        "user_id": null,
+        "workspace_id": 0
+    }
+]
diff --git a/storage/tests/toggl_data_import_test_1/workspace_users.json b/storage/tests/toggl_data_import_test_1/workspace_users.json
new file mode 100644
index 00000000..356daa1f
--- /dev/null
+++ b/storage/tests/toggl_data_import_test_1/workspace_users.json
@@ -0,0 +1,19 @@
+[
+    {
+        "active": true,
+        "admin": true,
+        "email": "peter.test@email.test",
+        "group_ids": [],
+        "id": 201,
+        "inactive": false,
+        "labour_cost": null,
+        "name": "Peter Tester",
+        "rate": null,
+        "rate_last_updated": null,
+        "role": "admin",
+        "timezone": "Europe/Vienna",
+        "uid": 0,
+        "wid": 0,
+        "working_hours_in_minutes": null
+    }
+]
diff --git a/storage/tests/toggl_import_test_1.csv b/storage/tests/toggl_time_entries_import_test_1.csv
similarity index 81%
rename from storage/tests/toggl_import_test_1.csv
rename to storage/tests/toggl_time_entries_import_test_1.csv
index 1fdfc8d6..effd1dfb 100644
--- a/storage/tests/toggl_import_test_1.csv
+++ b/storage/tests/toggl_time_entries_import_test_1.csv
@@ -1,3 +1,3 @@
 User,Email,Client,Project,Task,Description,Billable,Start date,Start time,End date,End time,Duration,Tags,Amount (EUR)
-Peter Tester,peter.test@email.test,,Project without Client,,"",No,2024-03-04,10:23:52,2024-03-04,10:23:52,00:00:00,Development,
+Peter Tester,peter.test@email.test,,Project without Client,,"",No,2024-03-04,10:23:52,2024-03-04,10:23:52,00:00:00,"Development, Backend",
 Peter Tester,peter.test@email.test,Big Company,Project for Big Company,Task 1,Working hard,Yes,2024-03-04,10:23:00,2024-03-04,11:23:01,01:00:01,,111.11
diff --git a/tests/Unit/Rules/ColorRuleTest.php b/tests/Unit/Rules/ColorRuleTest.php
new file mode 100644
index 00000000..3df5ee22
--- /dev/null
+++ b/tests/Unit/Rules/ColorRuleTest.php
@@ -0,0 +1,66 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Unit\Rules;
+
+use App\Rules\ColorRule;
+use Illuminate\Support\Facades\Validator;
+use Tests\TestCase;
+
+class ColorRuleTest extends TestCase
+{
+    public function test_validation_passes_if_value_is_valid_color(): void
+    {
+        // Arrange
+        $validator = Validator::make([
+            'color' => '#ef5350',
+        ], [
+            'color' => [new ColorRule()],
+        ]);
+
+        // Act
+        $isValid = $validator->passes();
+        $messages = $validator->messages()->toArray();
+
+        // Assert
+        $this->assertTrue($isValid);
+        $this->assertArrayNotHasKey('color', $messages);
+    }
+
+    public function test_validation_fails_if_value_is_not_a_string(): void
+    {
+        // Arrange
+        $validator = Validator::make([
+            'color' => true,
+        ], [
+            'color' => [new ColorRule()],
+        ]);
+
+        // Act
+        $isValid = $validator->passes();
+        $messages = $validator->messages()->toArray();
+
+        // Assert
+        $this->assertFalse($isValid);
+        $this->assertEquals('The color field must be a string.', $messages['color'][0]);
+    }
+
+    public function test_validation_fails_if_value_is_not_a_valid_color(): void
+    {
+        // Arrange
+        $validator = Validator::make([
+            'color' => 'rgb(0,0,0)',
+        ], [
+            'color' => [new ColorRule()],
+        ]);
+
+        // Act
+        $isValid = $validator->passes();
+        $messages = $validator->messages()->toArray();
+
+        // Assert
+        $this->assertFalse($isValid);
+        $this->assertEquals('The color field must be a valid color.', $messages['color'][0]);
+    }
+}
diff --git a/tests/Unit/Service/Import/ImportDatabaseHelperTest.php b/tests/Unit/Service/Import/ImportDatabaseHelperTest.php
index d1d156f2..9337b724 100644
--- a/tests/Unit/Service/Import/ImportDatabaseHelperTest.php
+++ b/tests/Unit/Service/Import/ImportDatabaseHelperTest.php
@@ -4,6 +4,7 @@ declare(strict_types=1);
 
 namespace Tests\Unit\Service\Import;
 
+use App\Models\Organization;
 use App\Models\Project;
 use App\Models\User;
 use App\Service\Import\ImportDatabaseHelper;
@@ -74,4 +75,64 @@ class ImportDatabaseHelperTest extends TestCase
         // Assert
         $this->fail();
     }
+
+    public function test_get_key_by_external_identifier_returns_key_for_external_identifier(): void
+    {
+        // Arrange
+        $organization = Organization::factory()->create();
+        $project = Project::factory()->forOrganization($organization)->create();
+        $externalIdentifier1 = '12345';
+        $externalIdentifier2 = '54321';
+        $helper = new ImportDatabaseHelper(Project::class, ['name', 'organization_id'], true);
+        $helper->getKey([
+            'name' => $project->name,
+            'organization_id' => $organization->getKey(),
+        ], [
+            'color' => '#000000',
+        ], $externalIdentifier1);
+        $helper->getKey([
+            'name' => 'Not existing project',
+            'organization_id' => $organization->getKey(),
+        ], [
+            'color' => '#000000',
+        ], $externalIdentifier2);
+
+        // Act
+        $key1 = $helper->getKeyByExternalIdentifier($externalIdentifier1);
+        $key2 = $helper->getKeyByExternalIdentifier($externalIdentifier2);
+
+        // Assert
+        $this->assertSame($project->getKey(), $key1);
+        $this->assertSame(Project::where('name', '=', 'Not existing project')->first()->getKey(), $key2);
+    }
+
+    public function test_get_external_ids_returns_all_external_ids_that_were_temporary_stored_via_get_key(): void
+    {
+        // Arrange
+        $organization = Organization::factory()->create();
+        $project = Project::factory()->forOrganization($organization)->create();
+        $externalIdentifier1 = '12345';
+        $externalIdentifier2 = '54321';
+        $helper = new ImportDatabaseHelper(Project::class, ['name', 'organization_id'], true);
+        $helper->getKey([
+            'name' => $project->name,
+            'organization_id' => $organization->getKey(),
+        ], [
+            'color' => '#000000',
+        ], $externalIdentifier1);
+        $helper->getKey([
+            'name' => 'Not existing project',
+            'organization_id' => $organization->getKey(),
+        ], [
+            'color' => '#000000',
+        ], $externalIdentifier2);
+
+        // Act
+        $externalKeys = $helper->getExternalIds();
+
+        // Assert
+        $this->assertCount(2, $externalKeys);
+        $this->assertContains($externalIdentifier1, $externalKeys);
+        $this->assertContains($externalIdentifier2, $externalKeys);
+    }
 }
diff --git a/tests/Unit/Service/Import/Importer/ClockifyProjectsImporterTest.php b/tests/Unit/Service/Import/Importer/ClockifyProjectsImporterTest.php
new file mode 100644
index 00000000..598a7de7
--- /dev/null
+++ b/tests/Unit/Service/Import/Importer/ClockifyProjectsImporterTest.php
@@ -0,0 +1,44 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Unit\Service\Import\Importer;
+
+use App\Models\Organization;
+use App\Service\Import\Importers\ClockifyProjectsImporter;
+
+class ClockifyProjectsImporterTest extends ImporterTestAbstract
+{
+    public function test_import_of_test_file_succeeds(): void
+    {
+        // Arrange
+        $organization = Organization::factory()->create();
+        $importer = new ClockifyProjectsImporter();
+        $importer->init($organization);
+        $data = file_get_contents(storage_path('tests/clockify_projects_import_test_1.csv'));
+
+        // Act
+        $importer->importData($data, []);
+
+        // Assert
+        $this->checkTestScenarioProjectsOnlyAfterImport();
+    }
+
+    public function test_import_of_test_file_twice_succeeds(): void
+    {
+        // Arrange
+        $organization = Organization::factory()->create();
+        $importer = new ClockifyProjectsImporter();
+        $importer->init($organization);
+        $data = file_get_contents(storage_path('tests/clockify_projects_import_test_1.csv'));
+        $importer->importData($data, []);
+        $importer = new ClockifyProjectsImporter();
+        $importer->init($organization);
+
+        // Act
+        $importer->importData($data, []);
+
+        // Assert
+        $this->checkTestScenarioProjectsOnlyAfterImport();
+    }
+}
diff --git a/tests/Unit/Service/Import/Importer/ClockifyTimeEntriesImporterTest.php b/tests/Unit/Service/Import/Importer/ClockifyTimeEntriesImporterTest.php
new file mode 100644
index 00000000..837646dc
--- /dev/null
+++ b/tests/Unit/Service/Import/Importer/ClockifyTimeEntriesImporterTest.php
@@ -0,0 +1,77 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Unit\Service\Import\Importer;
+
+use App\Models\Organization;
+use App\Models\TimeEntry;
+use App\Service\Import\Importers\ClockifyTimeEntriesImporter;
+
+class ClockifyTimeEntriesImporterTest extends ImporterTestAbstract
+{
+    public function test_import_of_test_file_succeeds(): void
+    {
+        // Arrange
+        $organization = Organization::factory()->create();
+        $importer = new ClockifyTimeEntriesImporter();
+        $importer->init($organization);
+        $data = file_get_contents(storage_path('tests/clockify_time_entries_import_test_1.csv'));
+
+        // Act
+        $importer->importData($data, []);
+
+        // Assert
+        $testScenario = $this->checkTestScenarioAfterImportExcludingTimeEntries();
+        $timeEntries = TimeEntry::all();
+        $this->assertCount(2, $timeEntries);
+        $timeEntry1 = $timeEntries->firstWhere('description', '');
+        $this->assertNotNull($timeEntry1);
+        $this->assertSame('', $timeEntry1->description);
+        $this->assertSame('2024-03-04 10:23:52', $timeEntry1->start->toDateTimeString());
+        $this->assertSame('2024-03-04 10:23:52', $timeEntry1->end->toDateTimeString());
+        $this->assertFalse($timeEntry1->billable);
+        $this->assertSame([$testScenario->tag1->getKey(), $testScenario->tag2->getKey()], $timeEntry1->tags);
+        $timeEntry2 = $timeEntries->firstWhere('description', 'Working hard');
+        $this->assertNotNull($timeEntry2);
+        $this->assertSame('Working hard', $timeEntry2->description);
+        $this->assertSame('2024-03-04 10:23:00', $timeEntry2->start->toDateTimeString());
+        $this->assertSame('2024-03-04 11:23:01', $timeEntry2->end->toDateTimeString());
+        $this->assertTrue($timeEntry2->billable);
+        $this->assertSame([], $timeEntry2->tags);
+    }
+
+    public function test_import_of_test_file_twice_succeeds(): void
+    {
+        // Arrange
+        $organization = Organization::factory()->create();
+        $importer = new ClockifyTimeEntriesImporter();
+        $importer->init($organization);
+        $data = file_get_contents(storage_path('tests/clockify_time_entries_import_test_1.csv'));
+        $importer->importData($data, []);
+        $importer = new ClockifyTimeEntriesImporter();
+        $importer->init($organization);
+
+        // Act
+        $importer->importData($data, []);
+
+        // Assert
+        $testScenario = $this->checkTestScenarioAfterImportExcludingTimeEntries();
+        $timeEntries = TimeEntry::all();
+        $this->assertCount(4, $timeEntries);
+        $timeEntry1 = $timeEntries->firstWhere('description', '');
+        $this->assertNotNull($timeEntry1);
+        $this->assertSame('', $timeEntry1->description);
+        $this->assertSame('2024-03-04 10:23:52', $timeEntry1->start->toDateTimeString());
+        $this->assertSame('2024-03-04 10:23:52', $timeEntry1->end->toDateTimeString());
+        $this->assertFalse($timeEntry1->billable);
+        $this->assertSame([$testScenario->tag1->getKey(), $testScenario->tag2->getKey()], $timeEntry1->tags);
+        $timeEntry2 = $timeEntries->firstWhere('description', 'Working hard');
+        $this->assertNotNull($timeEntry2);
+        $this->assertSame('Working hard', $timeEntry2->description);
+        $this->assertSame('2024-03-04 10:23:00', $timeEntry2->start->toDateTimeString());
+        $this->assertSame('2024-03-04 11:23:01', $timeEntry2->end->toDateTimeString());
+        $this->assertTrue($timeEntry2->billable);
+        $this->assertSame([], $timeEntry2->tags);
+    }
+}
diff --git a/tests/Unit/Service/Import/Importer/ImporterTestAbstract.php b/tests/Unit/Service/Import/Importer/ImporterTestAbstract.php
index 7b9c44ab..e22ed3a9 100644
--- a/tests/Unit/Service/Import/Importer/ImporterTestAbstract.php
+++ b/tests/Unit/Service/Import/Importer/ImporterTestAbstract.php
@@ -4,6 +4,7 @@ declare(strict_types=1);
 
 namespace Tests\Unit\Service\Import\Importer;
 
+use App\Models\Client;
 use App\Models\Project;
 use App\Models\Tag;
 use App\Models\Task;
@@ -16,7 +17,7 @@ class ImporterTestAbstract extends TestCase
     use RefreshDatabase;
 
     /**
-     * @return object{user1: User, project1: Project, project2: Project, tag1: Tag}
+     * @return object{user1: User, project1: Project, project2: Project, tag1: Tag, tag2: Tag}
      */
     protected function checkTestScenarioAfterImportExcludingTimeEntries(): object
     {
@@ -27,20 +28,27 @@ class ImporterTestAbstract extends TestCase
         $this->assertSame(null, $user1->password);
         $this->assertSame('Peter Tester', $user1->name);
         $this->assertSame('peter.test@email.test', $user1->email);
+        $clients = Client::all();
+        $this->assertCount(1, $clients);
+        $client1 = $clients->firstWhere('name', 'Big Company');
+        $this->assertNotNull($client1);
         $projects = Project::all();
         $this->assertCount(2, $projects);
         $project1 = $projects->firstWhere('name', 'Project without Client');
         $this->assertNotNull($project1);
+        $this->assertNull($project1->client_id);
         $project2 = $projects->firstWhere('name', 'Project for Big Company');
         $this->assertNotNull($project2);
+        $this->assertSame($client1->getKey(), $project2->client_id);
         $tasks = Task::all();
         $this->assertCount(1, $tasks);
         $task1 = $tasks->firstWhere('name', 'Task 1');
         $this->assertNotNull($task1);
         $this->assertSame($project2->getKey(), $task1->project_id);
         $tags = Tag::all();
-        $this->assertCount(1, $tags);
+        $this->assertCount(2, $tags);
         $tag1 = $tags->firstWhere('name', 'Development');
+        $tag2 = $tags->firstWhere('name', 'Backend');
         $this->assertNotNull($tag1);
 
         return (object) [
@@ -48,6 +56,44 @@ class ImporterTestAbstract extends TestCase
             'project1' => $project1,
             'project2' => $project2,
             'tag1' => $tag1,
+            'tag2' => $tag2,
+        ];
+    }
+
+    /**
+     * @return object{client1: Client, project1: Project, project2: Project, task1: Task}
+     */
+    protected function checkTestScenarioProjectsOnlyAfterImport(): object
+    {
+        $clients = Client::all();
+        $this->assertCount(1, $clients);
+        $client1 = $clients->firstWhere('name', 'Big Company');
+        $this->assertNotNull($client1);
+        $projects = Project::all();
+        $this->assertCount(2, $projects);
+        $project1 = $projects->firstWhere('name', 'Project without Client');
+        $this->assertNotNull($project1);
+        $this->assertNull($project1->client_id);
+        $project2 = $projects->firstWhere('name', 'Project for Big Company');
+        $this->assertNotNull($project2);
+        $this->assertSame($client1->getKey(), $project2->client_id);
+        $tasks = Task::all();
+        $this->assertCount(3, $tasks);
+        $task1 = $tasks->firstWhere('name', 'Task 1');
+        $this->assertNotNull($task1);
+        $this->assertSame($project2->getKey(), $task1->project_id);
+        $task2 = $tasks->firstWhere('name', 'Task 2');
+        $this->assertNotNull($task2);
+        $this->assertSame($project2->getKey(), $task2->project_id);
+        $task3 = $tasks->firstWhere('name', 'Task 3');
+        $this->assertNotNull($task3);
+        $this->assertSame($project2->getKey(), $task3->project_id);
+
+        return (object) [
+            'client1' => $client1,
+            'project1' => $project1,
+            'project2' => $project2,
+            'task1' => $task1,
         ];
     }
 }
diff --git a/tests/Unit/Service/Import/Importer/TogglDataImporterTest.php b/tests/Unit/Service/Import/Importer/TogglDataImporterTest.php
new file mode 100644
index 00000000..a57c72b5
--- /dev/null
+++ b/tests/Unit/Service/Import/Importer/TogglDataImporterTest.php
@@ -0,0 +1,64 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Unit\Service\Import\Importer;
+
+use App\Models\Organization;
+use App\Service\Import\Importers\TogglDataImporter;
+use Illuminate\Support\Facades\Storage;
+use Illuminate\Support\Str;
+use Spatie\TemporaryDirectory\TemporaryDirectory;
+use ZipArchive;
+
+class TogglDataImporterTest extends ImporterTestAbstract
+{
+    private function createTestZip(string $folder): string
+    {
+        $tempDir = TemporaryDirectory::make();
+        $zipPath = $tempDir->path('test.zip');
+        $zip = new ZipArchive();
+        $zip->open($zipPath, ZipArchive::CREATE);
+        foreach (Storage::disk('testfiles')->allFiles($folder) as $file) {
+            $zip->addFile(Storage::disk('testfiles')->path($file), Str::of($file)->after($folder.'/')->value());
+        }
+        $zip->close();
+
+        return $zipPath;
+    }
+
+    public function test_import_of_test_file_succeeds(): void
+    {
+        // Arrange
+        $zipPath = $this->createTestZip('toggl_data_import_test_1');
+        $organization = Organization::factory()->create();
+        $importer = new TogglDataImporter();
+        $importer->init($organization);
+        $data = file_get_contents($zipPath);
+
+        // Act
+        $importer->importData($data);
+
+        // Assert
+        $this->checkTestScenarioAfterImportExcludingTimeEntries();
+    }
+
+    public function test_import_of_test_file_twice_succeeds(): void
+    {
+        // Arrange
+        $zipPath = $this->createTestZip('toggl_data_import_test_1');
+        $organization = Organization::factory()->create();
+        $importer = new TogglDataImporter();
+        $importer->init($organization);
+        $data = file_get_contents($zipPath);
+        $importer->importData($data);
+        $importer = new TogglDataImporter();
+        $importer->init($organization);
+
+        // Act
+        $importer->importData($data);
+
+        // Assert
+        $this->checkTestScenarioAfterImportExcludingTimeEntries();
+    }
+}
diff --git a/tests/Unit/Service/Import/Importer/TogglTimeEntriesImporterTest.php b/tests/Unit/Service/Import/Importer/TogglTimeEntriesImporterTest.php
index 0e0f9ccf..28cca34b 100644
--- a/tests/Unit/Service/Import/Importer/TogglTimeEntriesImporterTest.php
+++ b/tests/Unit/Service/Import/Importer/TogglTimeEntriesImporterTest.php
@@ -16,13 +16,29 @@ class TogglTimeEntriesImporterTest extends ImporterTestAbstract
         $organization = Organization::factory()->create();
         $importer = new TogglTimeEntriesImporter();
         $importer->init($organization);
-        $data = file_get_contents(storage_path('tests/toggl_import_test_1.csv'));
+        $data = file_get_contents(storage_path('tests/toggl_time_entries_import_test_1.csv'));
 
         // Act
         $importer->importData($data, []);
 
         // Assert
-        $this->checkTestScenarioAfterImportExcludingTimeEntries();
+        $testScenario = $this->checkTestScenarioAfterImportExcludingTimeEntries();
+        $timeEntries = TimeEntry::all();
+        $this->assertCount(2, $timeEntries);
+        $timeEntry1 = $timeEntries->firstWhere('description', '');
+        $this->assertNotNull($timeEntry1);
+        $this->assertSame('', $timeEntry1->description);
+        $this->assertSame('2024-03-04 10:23:52', $timeEntry1->start->toDateTimeString());
+        $this->assertSame('2024-03-04 10:23:52', $timeEntry1->end->toDateTimeString());
+        $this->assertFalse($timeEntry1->billable);
+        $this->assertSame([$testScenario->tag1->getKey(), $testScenario->tag2->getKey()], $timeEntry1->tags);
+        $timeEntry2 = $timeEntries->firstWhere('description', 'Working hard');
+        $this->assertNotNull($timeEntry2);
+        $this->assertSame('Working hard', $timeEntry2->description);
+        $this->assertSame('2024-03-04 10:23:00', $timeEntry2->start->toDateTimeString());
+        $this->assertSame('2024-03-04 11:23:01', $timeEntry2->end->toDateTimeString());
+        $this->assertTrue($timeEntry2->billable);
+        $this->assertSame([], $timeEntry2->tags);
     }
 
     public function test_import_of_test_file_twice_succeeds(): void
@@ -31,7 +47,7 @@ class TogglTimeEntriesImporterTest extends ImporterTestAbstract
         $organization = Organization::factory()->create();
         $importer = new TogglTimeEntriesImporter();
         $importer->init($organization);
-        $data = file_get_contents(storage_path('tests/toggl_import_test_1.csv'));
+        $data = file_get_contents(storage_path('tests/toggl_time_entries_import_test_1.csv'));
         $importer->importData($data, []);
         $importer = new TogglTimeEntriesImporter();
         $importer->init($organization);
@@ -49,7 +65,7 @@ class TogglTimeEntriesImporterTest extends ImporterTestAbstract
         $this->assertSame('2024-03-04 10:23:52', $timeEntry1->start->toDateTimeString());
         $this->assertSame('2024-03-04 10:23:52', $timeEntry1->end->toDateTimeString());
         $this->assertFalse($timeEntry1->billable);
-        $this->assertSame([$testScenario->tag1->getKey()], $timeEntry1->tags);
+        $this->assertSame([$testScenario->tag1->getKey(), $testScenario->tag2->getKey()], $timeEntry1->tags);
         $timeEntry2 = $timeEntries->firstWhere('description', 'Working hard');
         $this->assertNotNull($timeEntry2);
         $this->assertSame('Working hard', $timeEntry2->description);