Cookie Policy — Shogi Chess AI
Effective date: 1 October 2026
1. What we use
We use strictly necessary cookies and local device storage to make the app work, plus optional analytics only if you allow it. We do not use advertising or cross-site tracking cookies. If that changes, this policy will be updated and consent will be requested where required.
2. Cookies and storage we set
| Name | Purpose | Duration | Type |
|---|---|---|---|
better-auth.session_token, better-auth.session_data (with a __Secure- prefix on HTTPS) |
Keep you signed in | 30 days, renewed while you use the app | Strictly necessary |
ca_app |
Remembers that you have used the app, so the home address opens it directly | 1 year | Strictly necessary |
ca_aid |
A random device identifier used only to apply fair-use limits for guests | 1 year | Strictly necessary |
ca_lichess_verifier, ca_lichess_state |
Protect the Lichess sign-in flow | ~10 minutes | Strictly necessary |
ca_username, ca_platform |
Remember the chess account you linked | ~30 days | Functional |
ca_consent |
Remembers your answer to the analytics question | Until you clear it | Strictly necessary |
PostHog storage (ph_*, local storage) |
Anonymous usage analytics — only if you choose "Allow" | Until you clear it | Analytics (optional) |
Preferences in local storage (ca_*: language, board theme, linked handles, cached analyses, classroom progress) |
Remember your settings and saved work on this device | Until you clear them | Functional |
Third-party providers (Google, Lichess) may set their own strictly-necessary cookies during sign-in, governed by their policies.
3. Legal basis
Strictly-necessary storage is used because it is needed to provide the service you asked for. Blocking it will prevent sign-in and may break review, classroom and game-loading features.
4. Managing cookies
- Browser settings can block or delete cookies; core features will be affected as described above.
- Signing out and clearing site data removes everything listed above. Deleting your account also clears this device's saved data.
5. Changes and contact
Updates will be posted here with a new effective date. Questions: ravi.sleepnow@gmail.com or utthamchess@gmail.com.