Privacy Policy
Last updated October 14, 2026.
The short version
The calculators run entirely in your browser. The numbers you enter are not sent to us and are not stored. This site does not set cookies and does not use analytics or advertising trackers. If you write to us through the contact form, we use your message only to reply.
Information you send us
The contact form asks for your email address, an optional name and your message. Submissions are delivered to us by email through the form service Web3Forms, and we use them only to answer you or fix the problem you report. See Web3Forms' privacy policy. We delete messages once they are no longer needed for that.
Information collected automatically
- Hosting. The site is hosted on Cloudflare Pages. Cloudflare processes technical data such as your IP address, browser type and the pages requested in order to deliver the site and keep it secure. See Cloudflare's privacy policy.
- Fonts. The typefaces load from Google Fonts, so your browser connects to Google's servers, which receive your IP address. See Google's privacy policy.
Cookies and tracking
We don't set cookies and we don't use analytics, advertising or social media trackers. If you switch between day and night mode, your browser remembers that one choice on your own device; it is never sent to us. If that changes, for example if we add analytics or advertising, we will update this page before it happens and describe what is collected and how to opt out.
Your rights
You can ask us what information we hold about you, ask us to correct it or ask us to delete it. Send the request through the contact page from the email address you used.
Children
This site is not directed at children under 13 and we don't knowingly collect their information.
Changes
When this policy changes, the date at the top of the page changes with it.