StrawberryCat Icon Viewer is available now on the iTunes App Store. It is designed to simulate the appearance of icons on the iPhone home screen. It allows icon designers to conveniently visualise how their icon will appear on iPhones and iPod touches with and without retina display technology*. In addition to the home screen visualisation, the appearance of icons in spotlight search results is also simulated.

Here are some screenshots in which I am testing the OpenCycleTeam icon, used with permission:

* Accurate simulation of the icon on a retina display requires the use of a device with a retina display.