Octavian Pro is the Swiss Army knife of music theory apps, offering a comprehensive collection of 550+ scales and 100+ chords. This versatile tool provides deep options for viewing, listening, and cross-referencing, making it an essential resource for musicians, students, composers, and songwriters alike.

Featuring an extensive library of scales from around the world and throughout history, Octavian allows users to explore any scale with any root note, in any mode, and delve into the chords and harmony within each scale. Additionally, users can access over 100 chords, including sevenths, elevenths, ninths, and thirteenths, with the ability to invert chords and browse scales that incorporate specific chords.