I18n Studio

I18n Studio is a macOS app that helps developers translate and localize software projects using GPT-4. It reads localization files directly from a project, including JSON, XML, Localizable.strings, and String Catalog formats, and integrates with Xcode, VSCode, and Android Studio so translated strings are written back into the project automatically. Developers can translate a single value, a full language, or an entire project in one batch, and can attach comments to specific strings to give the AI context, improving translation accuracy. Custom rules let users mark terms that should never be translated or set formatting and capitalization preferences that apply across the whole project. The tool is built for iOS, macOS, Android, and JavaScript developers who need to add or update multiple languages without manually editing translation files or paying for a full localization service. It requires macOS 11 or later and is a free download, but translation itself runs on GPT-4 through the user's own API key rather than a bundled subscription, so ongoing translation costs depend on OpenAI's API pricing rather than a flat fee from I18n Studio. New users get a starting allotment of free GPT-4 tokens to try the workflow before committing their own key.