Mobile application development has been growing faster than ever. Almost every business needs a mobile app to stay competitive in the market. As cross-platform mobile app development frameworks like React Native allow companies to build both iOS and Android apps using the single source code and single programming language; Flutter is another hot cross-platform mobile application development framework backed by Google.
Flutter is an open-source, multi-platform, mobile SDK that can be used to build iOS and Android apps with the same source code. Flutter has been around for quite some time now, but it's gotten more attention since Google released a first stable release. The apps built with Flutter look almost like native apps, which might be the reason big companies like Alibaba, Groupon, and many others started using it. Flutter apps can be tested using various testing layers.