Legal

Privacy Policy

DerivaDojo is built for learning. You can use every practice feature without an account.

No-account mode

Without signing in, Mastery Scores and belt awards are stored only on this device (browser localStorage). We do not receive that progress. If you clear site data or switch devices, that local progress is gone unless you previously signed in and synced.

Optional accounts (ages 13+)

Accounts are optional and intended for learners age 13 and older. We do not collect birthdates. Signing in may store:

• Your email address (from your Google account)
• A progress JSON blob (per-skill Mastery Scores and course belt awards) so you can restore progress on another device

Younger learners can use the full product without an account; progress stays on the device.

Problem & feature requests

The request box stores what you type, the request type, the course you picked (if any), and the page you sent it from. The email field is optional and only used to tell you when your request ships — leave it blank and we have no way to contact you. Do not include personal details in the message. Requests are not published.

Children (COPPA)

DerivaDojo may be used by K–12 learners. We do not knowingly collect personal information from children under 13. If you believe a child has created an account or provided personal information, contact us and we will delete it promptly.

Deleting an account

Email derivadojo@gmail.com to delete your account and server-stored progress. See also the Contact page.

Updates

We may update this policy as the product grows. Continued use after changes means you accept the revised policy.

Last updated: August 2026