Chord Graph: Music Theory

Chord Graph is a music theory app for iPhone and iPad that shows how chords relate to each other, so you can see harmony instead of memorizing it. It has 11 interactive views, a 90-lesson course with quizzes, a chromatic tuner and a daily challenge, and it works offline.

WHAT YOU CAN DO
• See the circle of fifths as four rings, with the relationships between chords drawn in
• Explore 11 views of the same harmony: circle of fifths, modulation tree, radial modulation tree, augmented web, diatonic, Tonnetz, progressions, modal interchange, voicings, modulation paths and the Playground
• Build your own chord progression of up to 16 steps in the Playground, with next-chord suggestions, tempo and looping
• Follow a 90-lesson music theory course in six levels, from what a note is to scales, intervals, cadences, modes, secondary dominants and modulation, with a 3-question quiz at the end of each lesson
• Tune guitar, bass or ukulele with a chromatic tuner that works through the microphone, with an adjustable A4 reference
• Take the daily challenge: 5 music theory questions, the same for every player on the same date, one attempt a day, with a streak counter and longest streak, an emoji-grid result you can share without spoilers, an optional reminder and a practice mode
• Try Live mode on the circle of fifths: with the microphone it follows the single notes you play
• Use all 24 keys, with note names in letters (C-D-E) or solfège (Do-Re-Mi), in light or dark theme

WHO IT IS FOR
Pianists, guitarists, bassists, ukulele players, songwriters and music students, from beginners to advanced. You do not need an instrument or a music background to start. It runs on iPhone and iPad with iOS 15 or later.

HOW IT WORKS
1. Pick one of the 24 keys.
2. Tap a chord to hear it and see where it can go next.
3. Switch views, build a progression in the Playground or follow a lesson.

COMMON QUESTIONS
How does the circle of fifths work in Chord Graph?
It has four rings, with the relationships between chords drawn between them. Tap any chord to hear it and see where it can go next.

Do I need an instrument or a music background?
No. The course starts with what a note is and goes on to modulation, modes and advanced harmony, and every chord plays when you tap it. A piano or guitar helps but is not required.

Does Chord Graph work offline?
Yes. The lessons, quizzes, sound