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. hello@ototheory.com Privacy: https://ototheory.com/privacy Terms: https://ototheory.com/terms Build progressions and enjoy songwriting with OtoTheory.