Adobe Photoshop Express (Android/iOS/Free)
Adobe’s Photoshop is the best photo editor for photos. Period. Photoshop Express brings some of that magic to mobile devices in a smaller package. Along with providing some great one-touch effects for various tasks like reducing noise, Photoshop Express lets you use simple gestures like crop, rotate and colour adjustments. You also get many effects like vibrant and rainbow, borders like film emulsion, Halftone and filters like sketch, sharpen and soft focus for free. If you want to go beyond these features, you can use in-app purchases to buy an additional 45 effects and 40 borders. Once you are done it gives you easy to use sharing options to share the altered photos while also saving the original on your device.
Fhotoroom (Windows Phone, Free)
Good photo editing apps for Windows Phone are few and far between. Among those, Fhotoroom stands out for its photo editing tools and usability. Including with the usual basic photo editing tools, you get 18 powerful editing functions for changing tones, saturation etcetera. Once you are done with basic editing, you can use any of the 50 styles, Tsar and Pulp Fiction to name a few, to give character to your photos and top them up with one of the 27 custom designed frames. Unlike many of the other apps, you can take pictures from inside the app, which after editing can be shared on social networks.
BeFunky Photo Editor (Android, Free)
BeFunky boasts of being not only the most popular photo editors on Android, but also of being one of the easiest to use. And it boasts of being the only app that allows for an unlimited number of edits that can all be undone to go back to the original. Apart from that it offers the usual suite of editing tools which are complemented by some specials like temperature adjustment, has over 30 effects and loads of frames. Comes with standard sharing options.
iPhoto (iOS, Rs 270)
iPhoto is hands-down the best photo editing tool for anyone with iOS devices. As the leader of the flagship iLife software for iOS devices, iPhoto makes use of gestures to bring some powerful tools to the mobile photo experience. Starting from simple editing tools, you can go up to professional quality effects using different effects, brushes, filters and borders. Once when you are done with editing, iPhoto truly comes into its own. Using iCloud you can arrange your photos as beautiful photo-journals which can be shared.