React Native is a technology created by Facebook that uses the React framework but allows you to build mobile apps. JavaScript developers can leverage their existing JS and CSS knowledge when using React Native, but the sweetest part of the deal’s that when you write a single app in React Native, you end up with two separate apps: an iOS app and an Android app.

Trying to develop an iOS app by itself or an Android app by itself means doing everything twice. By using React Native, you can get it done in one fell-swoop. That means double the bang for your buck, and that means a lot to clients.