▶✨ AI Import
✨ AI Import on iOS App
Import chord progressions from AI — just copy & paste. Play with grooves, analyze Roman numerals, export MIDI.
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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
Paste Chords from AI
OtoTheory is the fastest way to hear chord progressions generated by AI. Copy the output from ChatGPT, Claude, or Gemini — paste it into the builder — and press play. The parser automatically recognizes chord names, section labels like [Verse] and [Chorus], and various notation formats including pipe-separated bars.
Share Your Progressions
Every chord progression you create can be shared as a URL. Post it on Reddit, X (Twitter), or send it to a bandmate — they'll hear your exact progression when they open the link. No account or sign-up required.
Want the full experience? Get the iOS app for MIDI/audio export, unlimited saves, iCloud sync, and more.