Privacy Policy
1. Data We Collect
OtoTheory collects only the minimum data needed to provide and improve the service: device identifiers, in-app purchase status, usage events (e.g., chord progression playback, export), diagnostics (crash/performance), and approximate location derived from IP address. We do not access your contacts, photos, or files. If you contact our support team via email, your email address is used solely for support purposes.
2. Where Your Data Is Stored
OtoTheory does not store your personal data on its own servers. Your data is stored in the following locations:
| Data Type | Storage Location | Managed By |
|---|---|---|
| iOS Sketch data | Your device (local) | You |
| iOS Cloud sync data (Pro) | Your iCloud account (Apple CloudKit) | You / Apple |
| Web Sketch data | Your browser (localStorage) | You |
| iOS Analytics | Firebase Analytics (Google) | |
| Web Analytics | Google Analytics 4 (Google) | |
| iOS Ad data (Free only) | Google AdMob | |
| Both Hosting logs | Vercel (website hosting) | Vercel |
3. Purposes
We use collected data to provide app features (sketch saving, MIDI/audio export, etc.), improve the product through analytics, handle customer support, and send important service notices. For the iOS Free plan, Google AdMob displays ads to sustain free access.
4. Third-Party Services
We never sell your personal data. OtoTheory uses the following third-party services, and their handling of your data is governed by their respective privacy policies:
5. Advertising (Google AdSense)
The Service displays advertisements served by Google AdSense, a third-party advertising service provided by Google LLC. Google AdSense uses cookies and similar technologies to serve ads based on your prior visits to this website or other websites.
Google's use of advertising cookies enables it and its partners to serve ads to you based on your visits to this website and/or other websites on the Internet. You may opt out of personalized advertising by visiting Google Ads Settings. You may also opt out of a third-party vendor's use of cookies for personalized advertising by visiting www.aboutads.info.
For more information on Google's data collection and use practices, see Google's How Google uses information from sites or apps that use our services.
6. Data Retention and Deletion
Device data: Sketch data is stored on your device. Uninstalling the app removes it completely.
iCloud data: If you use Pro cloud sync, sketch data is stored in your iCloud account. You can manage or delete it via iOS Settings → Apple ID → iCloud → Manage Storage → OtoTheory.
Third-party data: Data held by Firebase Analytics, Google Analytics 4, AdMob, and similar services is subject to their respective privacy and retention policies.
For deletion requests or questions, contact us at support@ototheory.com. We will respond within the scope we can support.
7. Security
All communications are encrypted via HTTPS. Website hosting uses Vercel (global CDN). iOS cloud sync uses Apple CloudKit's encrypted infrastructure.
8. Your Rights
Device data is completely erased by deleting the app. iCloud data can be deleted from iOS Settings → Apple ID → iCloud → Manage Storage → OtoTheory. For questions about other data, contact support@ototheory.com.
9. Children
OtoTheory is not directed to children under 13. We do not knowingly collect personal information from children under 13.
10. Changes to This Policy
We will notify you of significant changes on this page. Continued use of OtoTheory after changes constitutes acceptance of the updated policy.