Octavian Keyboard Calculator

Octavian, Keyboard Calculator, is the essential musical reference tool for any musician, student, composer, songwriter, pianist, keyboard player, or hobbyist. Whether your specialty is classical, jazz, blues, or rock, Octavian provides instant access to over 500 scales and 50 chords, with any root note and in any mode or inversion.

iPhone:

iPad:

Price: $2.99 (Universal App)
View this app in the App Store
Developers Website