Flutter, now in beta, is Google attempt to create a framework for cross-platform interfaces for both iOS and Android apps that behave and feel like native, although not standard, UIs.
Flutter supports a reactive-style approach to UI definition, similar to React Native. What sets it apart from other cross-platform Web view-based frameworks is its reliance on Dart to avoid the need for a JavaScript bridge between the UI and the native services provided by the OS platform. Those include for example location services, sensor access, camera, etc. By using Dart, which is compiled ahead-of-time into native code, Flutter does not pay the cost of context switching due to the JavaScript bridge.
