Look up any scale or mode, in any of the twelve keys, and actually hear it played on a keyboard you can tap. Most theory apps hand you a static chart and leave you to imagine the sound. ScaleBook lights the scale up across a two-octave piano, spells every note with the correct sharps or flats, plays it back ascending or descending, and builds the diatonic chords that go with it — so the shape, the name and the sound land at the same time. WHAT YOU GET - 18 scales and modes across six families