OtoTheory is a chord progression builder. Create theory-correct progressions intuitively — no theory knowledge required.
Now with AI import: ask AI for any song's chords, copy & paste. Degree analysis, backing playback, and MIDI export — instantly.
Who Is This For?
Guitarists who want to write songs without theory
Players seeking scale guides for solos
DTM users needing pre-production tools
Acoustic players needing capo suggestions
Songwriters wanting chord substitution ideas
Bassists and keyboardists exploring chord tones
Free — All Creative Tools
▸ AI Chord Import
Ask AI for any song's chords, copy & paste. Instant analysis and playback.
▸ Chord Progression Builder
12-slot grid. Pick a key and scale — only correct chords appear. Tensions and slash chords included. Auto-loop, BPM 60-180.
▸ 15 Groove Patterns
All 15 grooves free. Edit chords in real-time while playing.
▸ 50 Presets
Pop, Jazz, Blues, Rock, Ballad — all 50 presets free.
▸ OtoTheory AI
Bridge, Substitute, Advanced modes. AI-powered suggestions to expand your ideas.
▸ Section Management
Verse, Chorus, Bridge. Set repeat counts per section.
▸ Scale Analysis
Auto-detect key and scale. Fit %, degree notation (I, IV, V).
▸ Fretboard & Keyboard
Guitar, bass, piano views. Chord tones highlight in real-time during playback. Tap to play.
▸ Capo Suggestions & 3 Local Saves
Pro — Unlimited Workflow ($2.99/mo)
▸ MIDI Export
Groove arrangement → MIDI. Chord Track, Guide Tones, Bass Track, section markers. Logic Pro, Cubase, Ableton ready.
▸ Audio Export
Groove-backed AAC files for videos and social media.
▸ Unlimited Export
No limits. *Free: 1/day via ad.
▸ Unlimited Saves + iCloud Sync
Sync iPhone & iPad. Transfers to new devices.
▸ Ad-Free
Why OtoTheory?
No Theory Required: Pick a key, select chords. Done.
Game-Like Editing: Swap chords in real-time while grooves play.
3 Visual Views: Guitar, bass, keyboard — chord tones highlighted during playback.
DAW Ready: MIDI export with groove arrangement. Phone to DAW seamlessly.
Acoustic Friendly: Capo suggestions for comfortable positions.
FAQ
Q: Need music theory?
A: No. Pick a key and scale — correct chords appear automatically.
Q: Free vs Pro?
A: All creative features free (15 grooves, 50 presets, all chords, AI, sections). Pro: unlimited export, unlimited saves + iCloud, ad-free.
Q: MIDI export?
A: Pro exports groove arrangement as MIDI with chord track, guide tones, bass, markers.
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Terms: https://ototheory.com/terms
Build progressions and enjoy songwriting with OtoTheory.
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