BindChord is the latest app to bring simple thumb-based chord play to the iPhone.
The developer is Japanese, and the English iTunes description is kind sparse, but I think you'll get the idea. Run your thumb around the screen and play chords quickly!
Bind Chord is novel instrument app.
You can play any chord as you like with ease. Tapping and Movement enable you to assemble many kinds of chords.
From the start, there are three instruments and three skins. You can choose appearance of this app in your way.