The new Snapseed 2.0 is out. It's the only smartphone based photoretouching app that I use. and here is version 2. For a long time I thought Google would abandon it but they put it back online after buying over Nik software. And here is the brand new version that you have to see!
It's available for Iphone, Ipad, Android, Mac and PC. It's a real creative tool. Unlike Instagram that dirties pictures, Snapseed realy makes your pics better. It brings out textures and enhances definition and colors so your pictures will stand out from the crowd. Moreover it's non destructive with means that you retain the original picture to make many versions of the same.
Here is a little example of an iPhone panorama treated with Snapseed.
PS:I'm not payed by google to say this , I'm a real enthusiast about this app.