The Olloclip app primarily does tasks that we've seen from just about every other photography app in existence. There's separate focus and metering points; boosted zoom to help precise focusing while using Macro; and video mode. But by far the most interesting is the Mesh Editor Tool. Using a fisheye or wide-angle lens on your iPhone is going to give you some pretty interesting distortion. The Mesh Editor lets you tweak the curvature of the image, letting you either counteract some of the lens's natural effects, or else amplify it for a more dramatic look.