If you need to develop an app for both iOS and Android, React Native is the best tool out there. It can reduce the code base by about 95%, saving you time and money. On top of that, React Native has a number of open-source libraries of pre-built components which can help you further speed up the development process.
For developers accustomed to working on the Web with React, this means you can write mobile apps with the performance and look and feel of a native application, while using familiar tools. React Native also represents an improvement over normal mobile development in two other areas: the developer experience and cross-platform development potential.