Privacy

Last updated November 2, 2026.

This site has no accounts and no forms. The calculator runs in your browser. “My pen” is saved in your browser's local storage on your device and is never sent to us.

The site is hosted on Cloudflare Pages, which may keep standard server logs (such as IP address and pages requested) for security and reliability. We do not use advertising or analytics cookies at present. If that changes, this page will be updated first.