Augmented Reality is everywhere. It is a hot and powerful topic. Everyone is doing it: Facebook with Occulus Rift, Microsoft with Hololens, Google with google glass or DAQRI with the Smart Helmet. We wanted to experiment with Augmented Reality on the web as well. That's how WebAR was born, an open source project which does Augmented Reality using web standards. We were wondering how far we could push the technology...the good news is that we can go pretty far! First, we succeeded on making AR run in a browser. We were already quite happy with this, but then we went for the moon and wanted to run that on mobile phones too. And it turns out it actually works! Imagine that: Being able to provide free AR for everybody to use in their everyday life with their mobile devices! WebAR shows us how to get Augmented Reality using only web technologies. It is an open source threex extension for three.js. You can even integrate it when creating your HTML projects! It captures the video with webrtc, localizes the AR markers using artoolkit, and displays the 3d on top of your reality with three.js. I will tell you everything you need to know to write your own Augmented Reality application! Trust me, it's gonna be fun!