Highly recommended

Im a casual learner, I work this into my spare time whenever my computers busy with a rendering task. Given my novice status, this app is simple with a high volume of information - the same as a Big Gag Book of Scales, but phone-sized. The interface is easy to read and condensed. I love this app, and I wish they continued to make it for iPad Pro and iPhone6. Very handy.

jludwick about Scales & Modes, v1.7.0