one shape per screen
This is a superb app for learning scales. It clearly shows each of the shapes as whole screen rather than trying to cram the whole fretboard onto the screen. It is therefore viable to use whilst playing the guitar, which after all is the whole idea. There is a wide selection of scales, most of which you will never want to use, but the favourite pentatonics are there. However, where are the natural minor , major , dorian and myxolydian?