Cross Platform UI Toolkit

An open source framework by Google, currently at version 3.44 with Dart 3.12, for building beautiful, natively compiled, multi-platform applications from a single codebase targeting iOS, Android, web, Windows, macOS, Linux, and embedded devices. The framework compiles directly to ARM or Intel machine code for mobile and desktop platforms and to JavaScript for web, achieving native performance without interpretation overhead. Its rendering engine uses Skia and Impeller graphics libraries to paint every pixel on screen, enabling complete control over styling, animation, and gesture handling with 120 frames per second performance targets. The widget system provides a comprehensive catalog of Material Design and Cupertino-styled components that adapt automatically to each platform, with fully customizable themes, dark mode support, and responsive layout utilities. Hot reload technology sub-second application state preservation during code changes, dramatically accelerating the development iteration cycle compared to traditional mobile development requiring full recompilation. The framework is used by major global brands including Alibaba with 500 million users on Xianyu, ByteDance with TikTok companion apps, BMW for vehicle companion applications, eBay for augmented reality shopping experiences, Google Pay for payments across multiple countries, Grab for ride-hailing, Groupon for deals, and Toyota for vehicle infotainment systems. Integration with Firebase provides backend services including authentication, cloud messaging, crash reporting, analytics, and Firestore database. The ecosystem includes over 40,000 packages on pub.dev for extending functionality with camera, maps, local storage, state management, networking, and platform channel communication for accessing native APIs not yet exposed through Dart.