Privacy
This site has no accounts, and does not ask for your name or email address. We count visits so we can see which pages and figures are used and where the site needs work. We use one tool for that: PostHog.
PostHog records the pages you view, your device info, and your approximate location (country and city). It also records clicks on links and controls.
PostHog does not use cookies, so it counts each page you open on its own and cannot recognize you from one page or visit to the next.
We use these numbers only to understand how the site is read and where to focus improvements and additions, and we do not sell them. PostHog handles the data under its own policies. Most ad blockers stop it.
Questions about this page can go to heartphysapp@gmail.com.
Last updated November 8, 2026.