Shrinkage is a fully automatic solution for taking HD retina graphic image assets, and creating standard resolution copies. It's great for iOS developers who don't want to have to worry about keeping all their image assets in sync. Once you've set up which directories you want Shrinkage to monitor, you're free to simply focus on creating retina graphics, and Shrinkage will make sure you always have an up to date standard copy. Now you can rapidly iterate on your app's artwork, without the tedious task of resizing.
Shrinkage supports PNG files with either "@2x" or "-hd" in the file name, enabling you to make stunning looking apps with UIKit or cocos2d.
This app will save you so much time and effort, you'll soon wonder how you went without it!