The auto harp app is a really fun and mimics an auto harp rather well. Unfortunately, actually playing is relatively difficult. Switching from one chord to another can be hard because of the small keys, and strumming the strings precisely is even harder.
I understand that the app is limited to the iPhone screen, but increasing the size of the keys would be a great start. Other than increasing the playability of the app I would suggest also publishing tunes to play on it. Or something of the like.
In all it is a fun app that mimics an instrument very close to my heart. I would recommend it to anyone interested in some musical fun on their iPhones.
Edward Lapine about Musical Autoharp