Chord progressions Ipad

Hi

My favorite Ipad app for chord progressions

"ProChords is a hand held road map of chords from 9000 songs
So if you are working on a song Fx."Am7,Em7,Am7,Em7" and don't know how to get out of the loop.
Tab it into ProChords and you will instantly know 31 different ways to continue.
It makes it fun to explore odd chord progressions and get inspiration for more original songwriting"

(http://www.prochords.dk/)