OtoTheory - Chord Progression

OtoTheory - Chord Progression

Songwriting & Scale Practice

0 ratings
10 reviews
$2.99 Free
In-App Purchases

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Details

  • Released
  • Updated
  • November 14, 2025
  • August 26, 2026

Features

OtoTheory - Chord Progression screenshot #1 for iPhone
OtoTheory - Chord Progression screenshot #2 for iPhone
OtoTheory - Chord Progression screenshot #3 for iPhone
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OtoTheory - Chord Progression screenshot #8 for iPhone
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
Show original description
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What's New in OtoTheory

3.16.0

August 26, 2026

Grooves now follow the chords you choose far more closely. We sharpened chord interpretation across 48 grooves, so the tensions you specify come through. And you can now see, right where you pick them, what each groove actually does. - Sharper chord interpretation Chords with tensions such as Fmaj9 and F7(b9) now carry that colour into the backing. Bass and pad parts follow your chord changes in more places, too. Exports match: audio and MIDI carry the chord as written, slash chords included. - Groove descriptions In the mixer you can read what each groove is built from and what it suits. Where you used to choose by name and sound alone, there is now something to go on. - See which grooves add colour Grooves that build their atmosphere from notes you did not specify, such as 9ths and 13ths, now carry a sparkle badge, along with how much they add. So you can tell apart the times you want your chord played straight from the times you want the genre's flavour. Feedback: support@ototheory.com

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Subscription plans

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

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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何をしたらいいかわからない

「提案」を押して「最初のコードを選ぼう」という指示のもとコードを選ぶと、「提案がありません」と仕事放棄するため何をどうすればいいかわからなくなる。チュートリアルが欲しい。

Response from developer

ご不便をおかけして申し訳ありませんでした。ご指摘の「提案」を押すと『最初のコードを選ぼう』のまま先に進めなくなる不具合は、最新アップデート(v3.5.0)で修正済みです。コードを選んだあとに、きちんと次のコードの提案が表示されるようになりました。 また、チュートリアルのご要望もありがとうございます。おっしゃる通り「まず何をすればいいか」が分かりにくい点は課題として認識しており、初めての方向けの案内を順次改善しています。 もしアップデート後もうまくいかない場合は、support@ototheory.com までお気軽にご連絡ください。貴重なフィードバックをありがとうございました。

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.