Open source. Open possibilities.

Flutter is Google's open-source SDK for building fast, beautiful apps for mobile, web, and desktop from a single codebase, featuring hot reload, rich widgets, and native performance.

React Native is a framework for building native Android and iOS apps with React. JavaScript code renders to native platform UI, with Fast Refresh, native modules and access to a large ecosystem of community libraries.

Expo is an open-source framework for building universal native apps with React that run on Android, iOS, and the web. The repository bundles the Expo SDK, Modules API, CLI, Router, Go client, templates, and documentation.