Privacy Policy

Last updated: July 3, 2026

What we collect

Your email (if you create an account), your training activity (drills, results, progress), and the public chess usernames you choose to scan. Anonymous sessions store the same training data under a random identifier. Payments are processed by Stripe. We never see your card.

What we use it for

Running the product: progress, spaced repetition scheduling, leaderboards (your display name only, and only if your profile is public), and the emails you opt into (streak reminders, weekly digest, each with an unsubscribe link). Product analytics are collected via PostHog (EU-hosted); we do not sell data to anyone.

Deletion & export

Delete your account anytime from the dashboard: profile and training data are removed immediately; billing records are retained as legally required. For a copy of your data, email us.

Cookies

We use only functional cookies (your session). No advertising trackers.

Contact

Data questions: hello@ (see site footer). ChessEndings is operated from France; EU data-protection law applies.