Flutter is an open source framework by Google for building beautiful, natively compiled, multi-platform applications from a single codebase. Instead of having to build an app on android and on IOS, flutter helps to build for both IOS and Android, as well as for web, desktop and other embedded devices (special-purpose computing).
Flutter does not build applications that are only slightly adaptable to each platform, it builds well adapted applications to all its platforms in a way that you can use device-specific hardwares and softwares like any other native framework. Therefore, flutter can reduce your engineering efforts by as much as 70%, helping you build more sustainable and cost efficient apps, while also increasing the speed and efficiency of development for faster response and implementation time.
The Flutter framework is supported by Google, and used by well known brands around the world like Google, Alibaba, eBay, BMW, Lotum(built 4pics 1word game), and Toyota.