No accounts. No cookies. No tracking.

What we store: your check-off progress, saved in your browser's local storage on your device. It never leaves your device unless you explicitly export it — as a sync code, a backup file, or a share card image.

What we never store: your identity. No accounts, no emails, no cookies set by us, no third-party analytics scripts on these pages.

Sync codes are self-contained strings: a version byte, a series id, your check-off bits, a date and a checksum. They contain nothing about who you are. Cloud sync (planned) will use the same shape — an anonymous code and a device-held secret, with no personal data on the server.

Clearing browser data erases your progress. That is the trade of device-only storage, and the export tools exist to beat it: keep a backup file, or carry a sync code.

Questions about anything here: the mail link on every page reaches a human.