React Native lets you build mobile apps using only JavaScript. It uses the same design as React, letting you compose a rich mobile UI from declarative components. React Native uses the same fundamental UI building blocks as regular iOS and Android apps. You just put those building blocks together using JavaScript and React. In this article we will show you how to create a Login Screen using React-Native that will work for both iOS and Android Platform. Software Prerequisites This example is developed on macOS. Before you begin, make sure you have all the software prerequisites are installed on your development machine. You need 'Homebrew' package management software to get all other dependency packages. Usually all modern macOS are preinstalled with home-brew. By any chance, if you don't have it on your machine, install it using following command. Learn more from official Homebrew website here. ruby -e "$(curl -fsSL "