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Privacy Policy

Last updated: April 9, 2026

1. Data Controller

Koydo is the controller of your personal data. Contact us at legal@koydo.app for privacy-related requests.

2. Data We Collect

2.1 Account Data

  • Email address
  • Display name (if provided)
  • Profile photo (if provided)
  • OAuth provider ID (e.g. Google)

2.2 Learning Data

  • Practice session results and scores
  • Question responses and timing
  • Study streak and progress milestones
  • Cortex AI mastery profile

2.3 Technical Data

  • IP address (for rate limiting only)
  • Browser and device type
  • Session cookies (Supabase Auth)

3. How We Use Your Data

  • To provide and improve the Koydo Music service
  • To personalize your learning experience via adaptive algorithms
  • To process subscription payments (via Stripe)
  • To send transactional emails (receipts, password resets)
  • To comply with legal obligations

4. Data Sharing

We do not sell your personal data. We share data only with:

  • Supabase — database and authentication provider
  • Stripe — payment processing
  • Sentry — error monitoring (anonymized)

5. Your Rights

You have the right to access, correct, delete, and export your data. Contact legal@koydo.app to exercise these rights.

6. Data Retention

Account data is retained for as long as your account is active. Practice data is retained for 2 years after your last session. You may request deletion at any time.

7. Cookies

We use strictly necessary cookies for authentication. No advertising or tracking cookies are used.

8. Contact

Privacy inquiries: legal@koydo.app