Privacy
This site collects nothing about you. There is no account, no advertising, no analytics and no cookies.
What is stored, and where
Your boards, times and progress are saved in this browser's local storage, on your device. They are never sent anywhere, and clearing the site's data in your browser removes them. So that the site works without a connection, the browser also keeps a copy of its pages and fonts.
Who serves the pages
The site is a set of static files hosted on GitHub Pages. Like any web host, GitHub receives the address your request comes from and may log it; see GitHub's privacy statement. The fonts and scripts are served from this site, not from a third party.
The apps
Links to the App Store lead to Apple. Each app has its own privacy details on its App Store page.