Jazz Theory
Spell chords, scales and tunes
Practice jazz harmony away from your instrument. Spell every note yourself, learn real tunes five levels deep, and fill a pixel-art jazz club with a band as you go.
Not a substitute for playing. It makes your playing time count.
Spell it
What's the 7th of D♭maj7? The guide tones through a ii–V–I in E♭? You name the notes, letter by letter, spelled the way a chart spells them. No keyboard or fretboard, so it works for any instrument.
Lessons
Twenty-three short lessons, from intervals and seventh chords to tritone subs, the backdoor ii–V and rhythm changes. Already know a topic? Test out and skip ahead.
Jam
Quick sets drawn from everything you've learned, spaced so each item comes back just before you'd forget it. It notices when you answer fast as well as right.
Gig
Learn real standards five levels deep: the changes, the guide tones, the chart, the form from memory, then every key.
Your club
Run a 16-bit jazz club. Every musician on stage is earned by mastering their part of the theory, and tips buy lights, a better bar and a grand piano.
Everywhere
Home and lock screen widgets, a reminder only on days you have reviews due, Siri and Shortcuts, and iCloud sync.
