ThatPhoto is very similar to a lot of other free photo editing apps for iOS, albeit faster and a bit prettier. Despite the polish, the app does little more than offer a basic editing interface with Aviary and a handful of sharing tools. That's not a bad thing -- those editing tools are fantastic -- but it offers similar functionality to a lot of other apps on the App Store, though with a much smoother browsing interface.
ThatPhoto's most attractive feature is the interface. After opening the app and approving access, ThatPhoto will display your entire photo stream on one of five cards at the bottom. Slide your finger and the cards will scroll through the entire thing quickly, loading hundreds or even thousands of photos much faster than comparable apps. It's quite cool to experience. At any time, tap a photo and choose the edit button (a large white pencil at the top of the screen) to launch Aviary. You can alternately tap the color wheel to launch a convert and share screen, allowing you to e-mail, SMS message, or share via any of the available apps on your device.
From start to finish, ThatPhoto is a fun app to use, but the functionality never rises above what's in so many other free photo apps for editing. If you are looking for a free photo app and don't already have one, you can't go wrong with ThatPhoto; but if you have a decent app on your device already and you don't need an INK-enabled app that can send to doctape or other apps on your device, you can skip this one for now.