intl_ai

ARB files AI translation that works with flutter_localizations and intl.

• Reads your project’s l10n.yaml
• Detects target locales from existing ARB files
• Translates missing strings using AI

Setup

Follow the official guide Internationalizing Flutter apps to set up flutter_localizations and intl.

Add intl_ai under dev_dependencies in your pubspec.yaml:

dev_dependencies:
  intl_ai: ^0.1.0

Add the ai_translation section to your l10n.yaml:

arb-dir: lib/l10n
template-arb-file: app_en.arb
output-localization-file: app_localizations.dart

ai_translation:
  provider: anthropic # options: anthropic | openai
  model: claude-haiku-4-5
  api_key_env: ANTHROPIC_API_KEY_INTL_AI
  ignore:
    - "DeepTime"
    - "Flutter"
  context: "A productivity and focus timer app for deep work sessions"

Export your API key:

export ANTHROPIC_API_KEY_INTL_AI=x

Usage

# Translate missing keys
dart run intl_ai translate

# Translate all keys (overwrite existing)
dart run intl_ai translate --full

# Dry run — save output to lib/l10n/.intl_ai_dry_run.json without modifying ARBs
dart run intl_ai translate --dry-run

# Apply a previously saved dry run
dart run intl_ai translate --apply-dry-run

# Translate a specific locale
dart run intl_ai translate --locale de

# Enable verbose logging
dart run intl_ai translate --verbose

Workflow

1. Add/modify keys in app_en.arb.
2. Run dart run intl_ai translate.
3. Run fvm flutter pub get to regenerate localizations code.