Snapseed (free - no IAP) is a high quality standalone photo editing app for Android. Users can easily edit your photos using many of the built in features like auto correct and selective adjustments. Free from Google and included in the G+ app.
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Pro Clever Interface
Snapseed interface is controlled with swipes, up and down to choose the option and left and right to choose the intensity. It does take a bit of getting used to, but once you have the interface is very nice and easy to use.
Pro Selective adjustments
In order to make adjustments to just one part of an image, tap and hold the box on the top right corner of the screen.
Pro G+ integration
Google has also integrated most of Snapseeds features into the G+ app as well.
With the acquisition of Snapseed by Google, the app was lowered in price from $4.99 to free.
Pro High quality photo editing
Snapseed includes many features of high end photo editing software, auto correct, image tuning and other effects. Snapseed makes editing your photos easy and gives the photographer many options to choose from in how they present their images.
Scrolling up and down lets the user choose from different effects and tools, swiping left to right determines the intensity. This app includes many effects such as tilt shift that are hard to find elsewhere.
Con Limited social integration
Snapseed supports sharing with email, Facebook, and Twitter, but leaves out important networks like Instagram and Flickr.