At first, Emscripten sounds like the punch line to a tech joke: a compiler that converts C/C++ code into Asm.js, a subset of JavaScript that can then run via a Web browser or in the Node.js framework.

Facebook announced today that its React Native library is now available on Github. The library allows you to build native iOS and Android applications with JavaScript and Facebook’s React library.

The frameworks use fundamentally different programming languages and UI rendering methods and vary in other characteristics.