Too Long; Didn't Read
Flutter is a cross-platform mobile app development SDK for building apps for both Android & iOS operating systems. It is a set complete with a framework, widgets and all the tools a developer would require to build an attractive & functional mobile app. Flutter development is completely open-source and of course, its free! It is based on the Dart programming language, which is new, but really easy to learn and get started with. It is also as auto reload feature similar to that in React Native (called Hot Reload), which allows developers to view real-time changes in output simultaneously while changing the code itself.