OtoTheory

Subscription Terms

Last updated: February 21, 2026

Controller: TH Quest (Shinjuku, Tokyo, Japan) · support@ototheory.com

1. Plans and Pricing

OtoTheory offers a Free plan and a Pro plan. The Free plan includes all core features: AI chord import, 50+ presets, 15 groove patterns, all chords, OtoTheory AI (all modes), section management, fretboard visualization, key & scale detection, 3 local saves, and text export. The Pro plan adds unlimited MIDI/audio export, unlimited saves + iCloud sync, and ad-free experience. Pricing varies by region and is displayed in your local currency on the App Store (¥500/month in Japan).

For a detailed comparison of Free and Pro features, see the Pricing page.

2. Free Trial

First-time subscribers can start with a 7-day free trial, managed through the App Store. During the trial, all Pro features are available — including unlimited saves and iCloud sync. If you cancel before the trial ends, you will not be charged.

The free trial is provided by Apple through App Store Connect. OtoTheory does not collect payment information directly.

3. Reward Ad Export

Free plan users can watch a short reward ad to export once per day (MIDI or audio). Pro users get unlimited exports.

4. Payment

Payment is processed through Apple's in-app purchase system (App Store). TH Quest does not handle your payment information directly. Your subscription renews automatically each month. You will be charged within 24 hours before the current period ends unless you cancel beforehand.

5. How to Cancel

You can cancel your subscription at any time from Apple's settings:

iPhone / iPad: Settings → Apple ID → Subscriptions → OtoTheory Pro → Cancel Subscription

After cancellation, you can continue using Pro features until the end of your current billing period.

6. After Cancellation

Your data is never deleted when you cancel. Here's what happens:

ItemWhat Happens
Local sketchesRemain on your device. You can still view and edit them.
iCloud dataStays in your iCloud account (part of your personal storage).
Saving limitReturns to 3 sketches. Existing sketches are not deleted.
Re-subscribingiCloud sync resumes and all sketches become accessible again.

7. Refunds

Refunds are processed according to Apple's policies. To request a refund, visit reportaproblem.apple.com or contact Apple Support.

8. Contact

If you have any questions about your subscription, please contact us at support@ototheory.com.

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