OtoTheory - Chord Progression

Import chord progressions via AI. Scale analysis, degree display, fretboard/keyboard chord tones, groove playback & MIDI export. Songwriting & music theory made easy.

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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Build progressions and enjoy songwriting with OtoTheory.