Privacy policy
Last updated: 13 November 2026
Chess Comfort (chesscomfort.com) helps you build and practise chess opening trees and solve puzzles. We collect as little as possible. This page explains what we store, why, and how you can delete it.
Without an account
You can use Chess Comfort without signing in. Your opening trees, practice progress, puzzle record and settings are stored only in your own browser (local storage). We do not receive them.
If you sign in with Google
Signing in is optional. It lets you keep your opening trees in your account and use them on other devices. When you sign in, Google shares with us:
- your Google account ID (to recognise you next time),
- your email address,
- your first name (shown at the top of the page).
We then store your opening trees (moves and your practice progress) linked to your account. We never see your Google password and we do not get access to your Gmail, Drive or contacts.
If you subscribe to Premium
Payments are handled by Paddle.com, our Merchant of Record. Paddle collects your card or other payment details, your billing country and postcode, and anything it needs for tax and fraud prevention, under Paddle's privacy policy. We never see or store your card details. From Paddle we receive and store only: your Paddle customer and subscription IDs, your plan, its status and its dates (trial end, next payment, cancellation). We also note that you have used your free trial. We use this only to give you Premium and to show your billing status.
Cookies
We only use cookies that are needed for signing in: a session cookie that keeps you signed in for up to 30 days, and a short-lived cookie that protects the Google sign-in step. We do not use advertising or tracking cookies. Visitor statistics come from Cloudflare Web Analytics, which does not use cookies and does not track you across sites.
Other services we use
- Cloudflare hosts the website and the database (Cloudflare, Inc.).
- Google handles the optional sign-in.
- Paddle (Paddle.com Market Ltd) processes Premium payments as our Merchant of Record. Its checkout is loaded only on the Premium page.
- Lichess (lichess.org): when you use engine analysis, the chess position is sent to Lichess's public cloud evaluation; when you load your games, your Lichess username is sent to Lichess. Nothing else.
We do not sell your data and we do not share it with anyone else.
How long we keep it
We keep your account data until you delete your account. Sign-in sessions expire after 30 days. If you delete your account, any active subscription is cancelled first and we delete our billing records about you; Paddle keeps its own records of payments for as long as tax law requires.
Your rights
You can delete your account and everything saved in it at any time: open Settings and press Delete my account. Under the GDPR you also have the right to access, correct or export your data, and to complain to your data protection authority.
Children
Accounts are for people aged 16 or over. Younger players can use Chess Comfort without an account.
Contact
Chess Comfort is run by an individual based in Ireland. For any privacy question or request, write to hello@chesscomfort.com.
Changes
If we change this policy we will update the date at the top of this page.