Layar, the first camera-based AR app to really blow us (or anyone) away, has quietly slipped into the App Store. As with the Android version, the app overlays all kinds of information onto a live view of the world around you.
Layar layers, which let you install user-generated overlays of all different kinds of information, like this one, which tracks government bailout spending. The expansion possibilities here are huge.
https://gizmodo.com/augmented-reality-iphone-android-app-tracks-where-gover-5391303
Free