Nothing. This site is a static page with no forms, no login, no database, and no back-end that receives any information about you.
This site uses Cloudflare Web Analytics, a privacy-first, cookieless measurement tool, to count visits and see which referring sites are popular. It sets no cookies, does not track you across other websites, and does not fingerprint your device or collect any personal data — it records only aggregate, anonymous page-view counts. There are no advertising scripts and no other third-party trackers.
Every calculator this page links to runs entirely in your own browser — your inputs are computed and stored only on your device and are never transmitted. Each one has its own Privacy page with the specifics, plus a "Download this tool" button that saves it as an offline file making zero network calls. The homepage even includes a prompt you can hand your favorite AI to walk you through verifying all of this yourself.
Links to the calculators, the Ko-fi support page, and the feedback form are plain links that open in a new tab — this page sends nothing to them. What you do on those sites is governed by their own privacy policies.
The page is served as a static file by Cloudflare Workers. As with any website, Cloudflare may log standard, server-side request metadata (such as IP address and timestamp) for security and reliability, governed by Cloudflare's own privacy policy. This site stores no user data server-side.
If this policy changes, the "Last updated" date above will reflect it. Since no personal data is collected, changes are unlikely to affect you.