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Privacy Policy

Last updated: 9 September 2026

This Privacy Policy explains how ChessTenders ("we"), available at chesstenders.com, collects, uses, and protects your information. We aim to collect only what we need to run the Service.

Information we collect

  • Account data: email and authentication details, handled by our authentication provider (Supabase), plus profile data such as your rating, stats, and streaks.
  • Activity data: puzzles solved, training results, and other progress you generate while using the Service.
  • Connected accounts: if you link a Lichess or Chess.com account, we fetch your public games to provide analysis and training.
  • Usage statistics: first-party, cookie-free counts of visits and activity (pages viewed, puzzles attempted, games reviewed). Visitors who are not logged in are identified only by a daily changing hash of their IP address and browser that we cannot reverse; no IP address or cookie is stored, page addresses are recorded without their query strings, and raw events are deleted after 13 months. This needs no consent and cannot be linked to you across days.
  • Google Analytics: anonymous, aggregated usage data, only with your consent (see Cookies below).
  • Device-local data: some state (e.g. games in progress, evaluation cache) is stored locally in your browser and not sent to us.

How we use your information

To provide and improve the Service: maintain your account, save your progress, generate analysis, operate leaderboards, and understand how the Service is used. We do not sell your personal data.

Service providers

We rely on trusted providers to operate the Service, including Supabase (authentication and database), Vercel (hosting), and Google Analytics (consent-based usage measurement). These providers process data on our behalf.

Cookies and consent

We use essential cookies needed to run the Service, and analytics cookies only after you give consent via our cookie banner. You can decline analytics without losing access to core features.

Data retention and your rights

We keep your data while your account is active. You may request access to, correction of, or deletion of your personal data, and you can delete your account at any time. To exercise these rights, contact us.

Contact

For privacy questions or requests, contact us at chesstenders@gmail.com.