Tone Scale Ruler 2 app for iPhone and iPad
Tone Scale Ruler 2 - A must for every musician, music student or composer. Find the tones of all scales, chords or intervals in all keys and play them. The scale ruler can be swiped to every tone to display the desired scale with correct notation. It also helps you understand the building of scales by a visual representation of the scale (the pattern of intervals).
-enharmonic notation
-playback ascending or descending
-based on Higher School of Music theory