After you open or shoot a photo, you'll see rectangles along the bottom of the screen (or along the side if you're in landscape orientation), which you can swipe through to choose edits, adjustments, and effects.

Snapseed's interface is simple and clear, yet punches a lot of powerful and detailed capabilities. Thanks to Nik being sold to Google last fall, the app is now free. Nik's years of image-editing prowess shine in Snapseed and the app's interface takes good advantage of the iPhone's touch screen.

The company's Snapseed can not only add zest or interest to images shot with your iPhone, iPad, or iPod touch camera, but also share it on Flickr, Facebook, or Twitter. Nik Software is a more venerable maker of photo enhancement software, having developed pro-level effects for Photoshop for years.

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Snapseed video editing app