Privacy

Effective 2 October 2026

ReChess finds mistakes in your own chess games and lets you drill them. This page says what it keeps about you, where, and why. It is written to be read, not skimmed past.

What ReChess stores

• Your email address, used to sign you in and to send sign-up and password-reset mail. Nothing else is sent to it. If you sign in with Google or Apple, ReChess receives only the email address they share (with Apple, it can be a private relay address).
• Your Chess.com username, so ReChess knows whose games to look at.
• Positions from your Chess.com games — the ones ReChess flags as mistakes, with the evaluation and a link back to the game. These games are already public on Chess.com; ReChess reads them through Chess.com's public API and does not download or keep anything private.
• What you do in the app: which positions you have saved, solved or deleted, notes you write, and your review schedule. This is the record that makes the app useful across devices.
• Messages you send us through the contact form, with the email address you give, so we can reply. They go to our inbox and are not stored in the app.

What it does not do

• No advertising, no trackers, no analytics scripts. Nothing on this site reports your behaviour to a third party.
• Analysis runs on your own device. Your games are not sent to a server to be evaluated.
• Nothing is sold, shared or used to train anything.

Where it lives

Accounts and everything above are stored with Supabase, a hosted database. The site is served by Vercel. Sign-up and reset emails, and contact-form messages, are delivered by Resend. Each of these sees only what it needs to do its job.

Signed out, the app shows a fixed set of sample positions and stores nothing about you.

Deleting your account

Open your account settings and choose Delete account. Your account and everything above is removed at once and cannot be recovered. You can also write to support@rechessapp.com from the address you signed up with and we will do it for you.

Open-source software

ReChess analyses positions with Stockfish, which is free software under the GNU General Public License v3. The full licence text and a corresponding-source offer for the exact build shipped here are in the third-party notices (GPL-3.0.txt). Everything else is under permissive licences, listed in the same file.

Questions

Same address: support@rechessapp.com.

ReChess is made by Thumbli LLC. This page will change if what the app stores changes; the date at the top moves when it does.