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Flutter is an open-source SDK that developed and maintained by Google. It was release on late 2017 for cross-platform app development with a single codebase feature. It's uses Dart as a programming language you can check out more details about dart programming at dart.dev.com. Flutter has been most growing development community Worldwide in app development. With Flutter you have to write only one codebase and it will work for both iOS and Android. It's hot reload features helps developer to debugs code faster and do experiment with their application.