Appetite is a new service that detects apps from a screenshot of an iPhone's home screen. Since lauching a few days into the new year, the startup believe that with it's innovative computer vision and machine learning techniques, they can further improve upon this beta release.
Here's an example of how it detected Ashton Kutcher's iPhone when he posted it on twitter recently, http://appetite.io/a/c282709a
To try it out yourself, visit http://appetite.io or mail a screenshot of your iPhone's home screen to [email protected]
You can follow them on twitter @tryappetite The team also runs instant messaging client for iOS at http://verbs.im