Worthy...

...but the control buttons get in the way of the answer buttons, which in of themselves are too small. That, and any one looking at the fretboard with the guitar in her or his hands will see the fretboard in the opposite direction, so the app presents the fretboard essentially upside down, and the app offers no way to switch this. However, this app is better than all of the others Ive tried, especially because it allows the user to select the tuning for those of us who dont use standard tunings.

Bjstuhl about Fretuoso