Google Cardboard is an app that works with Google Cardboard-compatible VR headsets (also called viewers) and your iPhone. It not only helps you set up a Cardboard viewer but also includes a few VR experiences to get you started.
Try it now: Google Cardboard
This AR-powered app lets you overlay GIFs onto the real world and share your creations with friends. Imagine drawing in the air with cat GIFs.