React Native is an open source framework developed by Facebook to allow app developers to design a soft and simple cross-platform development by using ReactJS. The Main aim of this React Native framework is to improve the speed and performance of the native mobile app. and the advantage of this framework is Mobile app development by using React native support us to save money and time and helps to promote in the market sooner than building separate apps for different devices on Android and iOS. So with this framework, developers can build attractive apps for both platforms with User-friendly experience. A brand of modern technology, React Native is the native mobile app development services for iOS and Android platforms. With the development of this advanced technology, the large mobile application development enterprise is remodeling and affording ultra-speed and performance to their business solutions at affordable costs. With help of framework, developers can build an app once and can deploy both iOS and Android devices. This benefit is huge by saving expensive because Android app development and iOS app development are quite different Where iOS uses a different language like, Ruby, Python, Lua, Scheme, Lisp, Smalltalk, C#, Haskell, Action Script, JavaScript, Objective-C, C++, C, and GPS is different and process of creating animations if different and moreover network calls is also quite different. So expensive will differ for each development. This framework doesn't notice between two platforms.