OtoTheory - Chord Progression

OtoTheory - Chord Progression

Songwriting & Chord Detection

0 ratings
11 reviews
Free
In-App Purchases

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Details

  • Released
  • Updated
  • November 14, 2025
  • October 14, 2026

Features

OtoTheory - Chord Progression screenshot #1 for iPhone
OtoTheory - Chord Progression screenshot #2 for iPhone
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OtoTheory - Chord Progression screenshot #9 for iPhone
OtoTheory - Chord Progression screenshot #10 for iPhone
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About

Create music theory-correct chord progressions intuitively, even without prior knowledge. Features AI song analysis, real-time editing with backing tracks, and MIDI export for digital audio workstations.

✓AI Chord Import
✓Chord Progression Builder
✓15 Groove Patterns
✓50 Presets
✓OtoTheory AI Suggestions
✓MIDI Export
✓Fretboard & Keyboard Views
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What's New in OtoTheory

3.24.0

October 14, 2026

■ New groove: Slow Blues You can now play your chord progressions as a deep, slow triplet blues. Rolling piano triplets, a warm organ and strings, and horn riffs and hits play the chords you place. There's no guitar, so the stage is yours for soloing. Place 7th chords like C7, F7, and G7 for that classic blues sound. You'll find it third in Traditional (Pro, and you can preview it for free). ■ Recommended tempo for each groove The mixer now shows the tempo range where each groove sounds its best (for example, 120–180 BPM for Swing). Pro groove previews also play at a tempo that suits the groove. Your song's tempo stays the same. ■ Tempo down to 40 BPM You can now set the tempo as low as 40 BPM (it used to stop at 60). Slow blues and ballads at 50–55 BPM now play at their real speed. Default BPM in Settings also starts at 40. ■ Other small improvements Feedback: support@ototheory.com

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Subscriptions & In-App Purchases

OtoTheory

Ad-free, MIDI/PDF/Audio export, unlimited sketch saves

$4.991 Month
7 Days trial
Price Updates
July 28, 2026→$4.99
May 16, 2026→$3.99
January 21, 2026→$2.99
How to cancel OtoTheory subscription ⁉️

User reviews

コード検出を気にせず使えるのがいい

気になった曲を取り込んでコード進行を出す、というのを回数を気にせずやれるのが本当に助かってます。
思いついた時にポンポン試せるので、練習でも作曲でも結局これを開いてしまう。
あと買い切りがあるのがありがたい。サブスクだらけなので、一度払って終わりにできるのは大きいです。

気軽にコード進行が作れて楽しい

音楽理論を知らなくても、コード選んで鳴らして良ければ残す、というだけで 作曲が進んでいきます。触ってて楽しいです!
スマホでちょっと空いた時間にできるのもありがたいです…!
あとから直せるので雑に作り始められるのも自分には合っていました。 MIDI で書き出せるから、DAW に持っていってそのまま本格的に作り込めるところが魅力的でした。

The only one that lets me fix the chords

I've run songs through a bunch of chord detection sites. They're all a little
off somewhere, or they just hear a chord differently than I do, which is fair
enough, but you're stuck with whatever it hands you. Here you import the song,
it pulls out the chord progression, and then you can go in and change the ones
you don't agree with. That's the whole difference for me.
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Slash chords whenever I want them

Been writing songs with this for a while. The suggestions got a lot better
with this update, more options, weirder chords, and you hear them instantly,
so you can pick by ear without knowing why they work. Slash chords are still
the thing I use most, always right there in the list. Then MIDI export into
my DAW when it's done. No complaints really.
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Best MIDI export of any sketch app

The MIDI export alone is worth it. Chords land in my DAW as a real chord
track that reads correctly, and the drums come out as separate parts rather
than one merged track, so there's nothing to untangle before I start
arranging.

It has made everything that happens before the DAW so much easier. I rough
out a chord progression idea in OtoTheory, send it over as MIDI, and do the
real editing in my DAW — that flow is now settled for me.

Recent updates have been excellent. Keep going.
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Developer apps

FAQ

Do I need music theory knowledge to use OtoTheory?

No, OtoTheory is designed for users without prior theory knowledge. Simply pick a key and scale, and the app will automatically suggest correct chords.

What is the difference between the free and Pro versions of OtoTheory?

The free version offers all creative tools, including AI import, chord builder, grooves, presets, and AI suggestions. OtoTheory Pro unlocks unlimited export, unlimited saves with iCloud sync, and an ad-free experience for $2.99/month.

Can OtoTheory export to DAWs like Logic Pro or Ableton?

Yes, the Pro version allows MIDI export of your groove arrangement, including chord tracks, guide tones, bass tracks, and section markers, making it compatible with major DAWs.

Does OtoTheory have ads?

The free version of OtoTheory contains advertisements. The Pro subscription offers an ad-free experience.

What devices is OtoTheory available on?

OtoTheory is available on iPhone and iPad, supporting seamless syncing between devices with the Pro subscription.

How often is OtoTheory updated?

The app was last updated on August 12, 2026, indicating active development and support.

What are the subscription options for OtoTheory Pro?

OtoTheory Pro offers a monthly subscription for $4.99 with a 7-day free trial, and an annual subscription for $49.99, also with a 7-day free trial.

Can I use OtoTheory for scale practice?

Yes, OtoTheory provides scale guides for solos and features a fretboard and keyboard view where chord tones are highlighted in real-time during playback.