Using cutting edges technologies like Node.js, Angular.js and the emscripten project, you can create super-powerful web app that benefit from the codebase of already existing native application or library. In this presentation, I explain how we used emscripten to port GDevelop, an open source game creator, to a webapp called GDevApp.com which is virtually as powerful and capable as the native app! With asm.js being developed and integrated to browsers and with the development of emscripten, we are likely to see more and more applications and games made using this approach.