[](https://cirrus-ci.com/github/flutter/flutter/master)
[](https://cirrus-ci.com/github/flutter/flutter/master)
[](https://coveralls.io/github/flutter/flutter?branch=master)
[](https://coveralls.io/github/flutter/flutter?branch=master)
# Build beautiful native apps in record time
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.
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.
### Documentation
### Documentation
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emulators, simulators, and hardware for iOS
emulators, simulators, and hardware for iOS
and Android.
and Android.
<imgsrc="https://user-images.githubusercontent.com/919717/28131204-0f8c3cda-66ee-11e7-9428-6a0513eac75d.gif"alt="Make a change in your code, and your app changes instantly.">
<imgsrc="https://raw.githubusercontent.com/flutter/website/master/src/images/intellij/hot-reload.gif"alt="Make a change in your code, and your app changes instantly.">
## Expressive and flexible UI
Quickly ship features with a focus on native end-user experiences.
Layered architecture allows full customization, which results in incredibly
fast rendering and expressive and flexible designs.