Gridditor is a fabulous photo editing app for iPhone photography. It’s quite an inspiring app, it shows you four filters at any given time, one in each cardinal direction with your original image at the center. The farther you go in any direction, the stronger the effect gets. By arranging the previews in a grid, you can see the effect of applying multiple filters at once letting you edit faster, and showing you creative possibilities you may not have considered otherwise.
Gridditor usually retails for $1.99/£1.49 but today it is available for free. Click here to download.