Imagine using an AR app to plan and layout furniture in a space. How could you build your own Minecraft Earth? What would it be like to make the real world a level for your next game? All of these scenarios become possible with Unity AR Foundations. In this talk, we'll walk through the process of building AR apps using Unity, C#, and the Unity AR Foundations SDK. This framework enables you to leverage the strength of ARKit and ARCore with one codebase. We'll also explore ways web developers can build AR experiences with HTML and JavaScript.