Translation API

Translate your app metadata to 40+ languages using AI-powered translation that understands app store context.

Smart Translation

Our translation engine understands app store context, preserving keywords, brand names, and technical terms while adapting cultural nuances for each market.

Translate metadata from a source locale to one or more target locales.

POST /projects/:projectId/translate

Authentication

Requires API key with Authorization: Bearer <api_key> header

URL Parameters

Name	Type	Required	Description
`projectId`	`string`	Yes	The project ID

Request Body

Name	Type	Required	Description
`from`	`string`	Yes	Source locale code (e.g., "en-US")
`to`	`string[]`	Yes	Target locale codes or "all" for all supported locales
`fields`	`string[]`	No	Specific fields to translate. If omitted, translates all fields.
`preserveKeywords`	`boolean`	No	Keep certain terms untranslated (brand names, technical terms) (default: `true`)
`preservedTerms`	`string[]`	No	Additional terms to keep untranslated

Response Example

{
  "success": true,
  "data": {
    "translationId": "trans_xyz789",
    "status": "completed",
    "sourceLocale": "en-US",
    "targetLocales": ["es-ES", "fr-FR", "de-DE"],
    "results": {
      "es-ES": {
        "status": "completed",
        "metadata": {
          "name": "Mi Aplicación Increíble",
          "subtitle": "La mejor aplicación",
          "description": "Descripción traducida...",
          "keywords": "productividad, tareas, pendientes",
          "whatsNew": "¡Nuevas funciones agregadas!"
        }
      },
      "fr-FR": {
        "status": "completed",
        "metadata": {
          "name": "Mon Application Géniale",
          "subtitle": "La meilleure application",
          "description": "Description traduite...",
          "keywords": "productivité, tâches, à faire",
          "whatsNew": "Nouvelles fonctionnalités ajoutées!"
        }
      },
      "de-DE": {
        "status": "completed",
        "metadata": {
          "name": "Meine Tolle App",
          "subtitle": "Die beste App",
          "description": "Übersetzte Beschreibung...",
          "keywords": "Produktivität, Aufgaben, Todo",
          "whatsNew": "Neue Funktionen hinzugefügt!"
        }
      }
    },
    "usage": {
      "charactersTranslated": 4500,
      "creditsUsed": 45
    }
  }
}

Code Examples

curl -X POST https://api.appstorecopilot.com/v1/projects/proj_abc123/translate \
  -H "Authorization: Bearer $ASC_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "from": "en-US",
    "to": ["es-ES", "fr-FR", "de-DE"],
    "preserveKeywords": true,
    "preservedTerms": ["AppStore Copilot"]
  }'

Translation Quality

Our AI translation engine is specifically trained for app store content and:

Preserves brand names and technical terms
Adapts tone and style for each market
Respects character limits (30 chars for titles, 4000 for descriptions)
Handles emoji and special characters appropriately
Maintains keyword relevance for ASO (App Store Optimization)

Review Translations

While our AI produces high-quality translations, we recommend having a native speaker review translations for critical markets before publishing.

Translation Pricing

Translation is charged per character:

Plan	Included	Overage
Free	10,000 chars/month	Not available
Pro	100,000 chars/month	$0.01 per 100 chars
Enterprise	Unlimited	Custom pricing

Best Practices

Start with quality source content - Better source text produces better translations
Use preserved terms - Add brand names and product-specific terms to avoid unwanted translation
Translate incrementally - Start with your top markets, then expand
Review before publishing - Use the dashboard to review translations before pushing to stores