# Flutter ![Flutter logo][] android
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# Build beautiful native apps in record time web
Flutter is Google's mobile app SDK for crafting high-quality native interfaces on iOS and Android in record time. Flutter works with existing code, is used by developers and organizations around the world, and is free and open source. android-studio
### Documentation app
**Main site: [flutter.io][]** ui
* [Install](https://flutter.io/get-started/install/) google
* [Get started](https://flutter.io/get-started/) code
* [API documentation](https://docs.flutter.io/) get
* [Changelog](https://github.com/flutter/flutter/wiki/Changelog)
* [How to contribute](https://github.com/flutter/flutter/blob/master/CONTRIBUTING.md)
For announcements about new releases and breaking changes, follow the
[flutter-announce@googlegroups.com](https://groups.google.com/forum/#!forum/flutter-announce)
mailing list.
## Fast development
Flutter's <em>hot reload</em> helps you quickly
and easily experiment, build UIs, add features, and fix
bugs. Experience sub-second reload times,
without losing state, on
emulators, simulators, and hardware for iOS
and Android.
<img src="https://raw.githubusercontent.com/flutter/website/master/src/_assets/image/tools/android-studio/hot-reload.gif" alt="Make a change in your code, and your app changes instantly.">