Best app!!!!😀. One small point at the risk of being pedantic: many #11 chords appear in the charts. Strictly #11 chords have BOTH the 5 note and the b5/#11. Formula: 1,3,5,b7,(9),#11. This is a dissonant chord and difficult to find on the guitar. These are generally 7+ chords: 1,3,b5,b7. Check out Realchords Pro iPad app for all these chords in all possible positions - including the function to save new shapes for all the chords. Cheers