Open Source TypeScript Internationalization (I18N) Software

NGX-Translate is an internationalization library for Angular. It lets you define translations for your content in different languages and switch between them easily. It gives you access to a service, a directive and a pipe to handle any dynamic or static content. NGX-Translate is also extremely modular. It is written in a way that makes it really easy to replace any part with a custom implementation in case the existing one doesn't fit your needs. The main part of the library is named core. You can use it on its own, but it is usually a good idea to add a loader to load your translations into your application. You can also extract the strings from your code with the extractor. This makes it really easy to start and maintain your translations. By default, there is no loader available. You can add translations manually using setTranslation but it is better to use a loader. You can write your own loader, or import an existing one.

i1n is a localization platform for developers. A CLI pushes your translation keys and gets them back translated with AI, with variable protection and TypeScript type generation. Review and edit translations in the dashboard, mark them as manually approved, and get notified when source text changes make translations stale. Ships with an MCP server that connects to AI coding assistants (Cursor, Claude Code, Windsurf) so your agent can internationalize components directly from the IDE. Bridge Mode wraps existing i18next or next-intl setups with type safety, no migration needed. Open source CLI (MIT). Free tier is permanent.