Review from Crawdaddy:
"Guitar4you is another 99-cent chord app with potential, as it calculates chords instead of just retrieving them from a database—that’s a great way to come up with new inversions and changes to keep the rocking fresh"
This program allows you to have all the scales and chords in your hands, searching by pattern and changing the tuning.
The app works in both portrait and landscape mode. Chords are calculated rather than simply retrieved from a database, so you'll see all the position over the neck by moving your finger to select the starting fret.
In landscape mode the neck is zoomed and you can move it.
When in searching mode you have to draw a pattern over the neck, then double tap to confirm and finally iterate all the matching scales by pressing search again.