5 Diamond Music Services, Inc. releases Blues Scale Workout v1.2
iPhone, iPad / Education / Chords and Scales: This app will test your ability to recall all the Blues Scale shapes on the guitar. The minor Blues shapes are in the key of A minor. The major Blues shapes are in the key of C major.
www.440audio.com/en/software/vi58679-5-Diamond-Music-Services-Inc-Blues-Scale-Workout/