Privacy
We store almost nothing — and what we keep lives in your own browser.
No accounts, no tracking
There is no sign-up and no login. We run no advertising and no third-party analytics or trackers, and we neither sell nor share your data — because we don't collect it in the first place.
What stays on your device
Your progress — folios read, your review schedule, your settings, and any certificates — is saved in your browser's localStorage, on your own device. It never leaves your machine unless you export it, and clearing your browser data erases it.
Cookies
We set no tracking or advertising cookies. Your theme, reading-music preference, and a single flag that remembers you've dismissed the notice are all kept locally in your browser, not sent anywhere.
Certificates
If you choose to mint a certificate, its public record — an ID, the course, and a cryptographic signature — is stored so that anyone can verify it. No name or personal identity is required or kept.
Servers & logs
The site is served by Cloudflare, which keeps standard, short-lived request logs for security and reliability. We add nothing of our own to that.
Changes
Any change to this policy will appear here. Last revised 11 July 2026.