Privacy

This site doesn’t use advertising cookies, doesn’t ask for an account, and doesn’t need your email to show you anything.

The calculator runs in your browser. The numbers you enter stay in your address bar so you can share the link. We don’t store them.

We use Google Analytics to count visits and see which pages people read. It sets first-party cookies and receives your IP address, which Google uses for rough location. Advertising features, ad personalization and Google Signals are all switched off.

We also use Vercel Web Analytics, run by the company that hosts this site. It counts page views without cookies and without following you between sites, and we see only totals, never a profile of you.

Our host keeps standard server logs, which include IP addresses, for security and to keep the site running. When you follow a product link through /go/, our log line records the product, the page, the spot on the page and the state the click came from. The request also appears in the host logs described above. Google Analytics also counts that click as an event, alongside the page visit it already records.

Questions: hello@mlighthouse.com