I18n Studio is a macOS application that leverages GPT-4 to streamline app translation and localization. It allows developers to quickly translate app strings across multiple languages by simply clicking buttons. The tool supports context-aware translation through comments, enabling fine-tuning for capitalization, scenes, and custom instructions. It integrates seamlessly with Xcode, VSCode, and Android Studio, and handles file formats like JSON, XML, Localizable.strings, and String Catalog. The workflow consists of loading multi-language files, batch translating into target languages, and writing the translated results back to files. It is designed for developers needing a fast, AI-powered localization solution.