Flutter makes it easy and fast to build beautiful mobile apps. Flutter is a new mobile app SDK to help developers and designers build modern mobile apps for iOS and Android. Deliver features faster: Refresh times so fast, you can "paint" your app to life on hardware, emulators, and simulators. Craft beautiful UIs: Delight your users and make your brand stand out with rich motion, smooth scrolling, and beautiful customizable components. Used by Google: Flutter is used by Google and others in production, works with Firebase and other mobile app SDKs, and is open source.