Privacy and data

Opponent Scout only uses games that are already public. When you prepare for a player, your browser downloads their recent games directly from the public APIs of Chess.com or Lichess and analyzes them on your device with a chess engine. No sign-in to Chess.com or Lichess is needed or used.

We do not store Chess.com or Lichess games on our servers. We store only the analysis results.

• ▸If you are not signed in, the games and the analysis stay in your browser. The report is kept in this tab until you close it. So that an interrupted analysis can pick up where it stopped, each analyzed game is also kept in your browser's storage on this device for up to a week. It never leaves your device.
• ▸If you save a report, your browser sends the analyzed games to our server, which uses them once to build the game plan and then discards them. They are never written to our database.
• ▸What a saved report keeps is the analysis: statistics (results, openings played, error rates by phase, clock use), short move sequences that illustrate a pattern (an opening line or a trap they fell into), and links back to the original games on Chess.com or Lichess. No full game records (PGN) are kept.
• ▸Saved reports are private to the account that created them.

ChessBible is an analysis tool. It is not a database of players, and it does not collect or publish your chess history.

• ▸Game records on Chess.com and Lichess are public: anyone can open a player's profile and look through their games. Opponent Scout reads only those public games, the same ones anyone can see, and nothing else: no messages, chat, account settings or other private information.
• ▸Your games are not copied to our servers.
• ▸There are no public player pages on this site. A report is a private analysis seen only by the person who created it. We do not publish, share or sell reports.
• ▸If you would like reports made from your username removed, email chessbiblefyi@gmail.com with your username. We may ask you to confirm the account is yours, for example by adding a short code to your profile, and then delete them.

ChessBible is an independent site. It is not affiliated with or endorsed by Chess.com or Lichess.

If you create an account we keep your email address, your saved reports and your plan. Sign-in and the database are provided by Supabase.

You can delete your account at any time from your account page (Delete account). This permanently deletes the account, every report you saved, your unlocks and your newsletter subscription. If you have an active subscription, cancel it first (Membership → Manage subscription); an account with an active subscription cannot be deleted. Payment records stay with Stripe, as required for accounting. If you cannot sign in, email chessbiblefyi@gmail.com and we will delete it for you.

• ▸Stripe handles payments. Card details go to Stripe; we never see or store them.
• ▸Google Gemini writes the coach note on a report. It receives the report's statistics and the player's username, not your account details.
• ▸Resend sends the report emails you ask for.
• ▸PostHog gives us usage analytics: pages viewed, features used, which username was looked up, and errors such as a failed request to Chess.com or Lichess. When you are signed in, these events are linked to your account.
• ▸Vercel hosts the site.

We do not sell personal data and we do not show ads.

Accounts are meant for parents, coaches and adult players. We do not knowingly collect personal information from children under 13. If you believe a child has created an account, email us and we will delete it.

If this page changes, the date at the top changes with it. See also About.