# Flutter ![Flutter logo][]
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# Build beautiful native apps in record time
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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.
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### Documentation
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**Main site: [flutter.io][]**
* [Install](https://flutter.io/get-started/install/)
* [Get started](https://flutter.io/get-started/)
* [API documentation](https://docs.flutter.io/)
* [Changelog](https://github.com/flutter/flutter/wiki/Changelog)
* [How to contribute](https://github.com/flutter/flutter/blob/master/CONTRIBUTING.md)
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For announcements about new releases and breaking changes, follow the
[flutter-announce@googlegroups.com](https://groups.google.com/forum/#!forum/flutter-announce)
mailing list.
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## Fast development
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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.
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<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.">
原文：https://www.cnblogs.com/stonecutter/p/10824952.html