React Native is a great way to build apps that can easily be compiled to run on Android & iOS devices with single code base and minimal custom code for each platform. It’s open source technology and based on my first experience of creating an app without knowing much about ReactJS left me impressed. Check out this article on Smashing Magazine about building React Native Apps.

The idea of building mobile apps with JavaScript is not new. We’ve seen frameworks like Ionic and PhoneGap take on the challenge, and to some extent succeed in gaining a fair amount of developer and community support. These frameworks and the whole idea of building mobile apps with JavaScript never appealed to me, though. I always thought, why not just learn Swift/Objective-C or Java and build real apps? That definitely requires a significant amount of learning, but isn’t that what we developers do and should be good at? Quickly learn new languages and frameworks? What’s the point, then? For me, the advantages never outweighed the doubts.

Source: The Beauty Of React Native: Building Your First iOS App With JavaScript (Part 1) – Smashing Magazine