Cookie Policy

Derso uses cookies sparingly and intentionally.

Essential cookies

• Session cookie (better-auth session): required to remember who you are after sign-in. Lessons, progress, and Study do not work without it. It does not require consent.

Analytics cookies

We may use aggregated usage measurement (Google Analytics) to improve the service. Analytics cookies are not set without consent.

Third-party cookies

On payment pages, Stripe may use its own required cookies; details are in Stripe's policy.

Managing cookies

You can delete or block cookies in your browser settings; if you block the session cookie, sign-in will not work.