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Your SketchUntitled
Select a chord slot
C
Tonic
Stable landing
Am
Tonic Substitute
Emotional landing
F
Subdominant
Gentle expansion
G
Dominant
Strong resolution
Dm
Subdominant
Moving forward
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15
Do more with the iOS app
✓✨ Import chord progressions from AI (just copy & paste)
✓Use substitute, advanced & borrowed chord suggestions
✓Place 2 chords in 1 bar with Split Bar
✓Manage song structure with Section Mode
✓MIDI / Audio export
✓Advanced chords: slash chords, tensions & more
✨ AI Import on iOS App
Import chord progressions from AI — just copy & paste. Play with grooves, analyze Roman numerals, export MIDI.
Download on App StoreScan to download
Synth/⚡ Pulse
120
BPM
What is the Chord Progression Builder?
OtoTheory's Chord Progression Builder is a free online tool that lets you create, edit, and play chord progressions in real time. Choose from over 50 preset progressions, select from 15 groove patterns across 5 musical categories, and hear your ideas instantly — no downloads or sign-ups required. Built for guitar, bass, keyboard players, and DAW users who want to sketch musical ideas quickly.
Key Features
- Real-time playback while editing chords
- 50+ chord progression presets organized by mood and genre
- 15 groove patterns in 5 categories (Pop, Rock, Ballad, Funk, Latin)
- Automatic key and scale detection with OtoTheory AI
- DJ-style composition — swap chords without stopping playback
- Works on any modern browser, optimized for mobile and desktop
Who is it for?
- Songwriters looking for chord inspiration
- Guitarists and bassists exploring harmony beyond basic chords
- Keyboard players building accompaniment patterns
- DAW producers sketching ideas before opening their workstation
- Music theory students learning how chord progressions work by hearing them
Want the full experience? Get the iOS app for MIDI/audio export, unlimited saves, iCloud sync, and more.