Privacy Policy
Last updated: 29 August 2026
The short version
We collect nothing. There is no account, no sign-up, no analytics and no advertising on this site today. The tool runs entirely in your browser, so the measurements you type are never sent anywhere — there is no server here to send them to.
What is stored on your device
Two small values, both in your browser’s local storage, neither of which leaves it:
- Your theme preference — light, dark or system, so the page does not flash the wrong colour on your next visit.
- Your screen calibration (
rst.pxPerMm) — a single number, how many pixels your display puts in a millimetre, so you do not have to hold a bank card against the screen every time.
Clearing this site’s data in your browser removes both. Nothing else is written, and no cookies are set.
Analytics
None. There is no Google Analytics, no Cloudflare Web Analytics and no other measurement script on this site. If that changes, this page will say so before it does, and will name whatever is added.
Advertising
None. There are no ads and no advertising cookies today. This site is intended to carry advertising eventually; when it does, this section will name the network, and visitors in the EEA and UK will be asked for consent before any advertising cookie is set — not afterwards.
Hosting
The site is served by Cloudflare Pages. Like any web host, Cloudflare processes the technical details of each request — IP address, browser, and which page was asked for — to deliver the page and protect against attacks. That happens at the network level, we do not read it, and it is the only third party involved in serving this site. Their handling is covered byCloudflare’s privacy policy.
Your choices
Clear this site’s data to remove the theme and calibration values. Since nothing is collected, there is nothing to request, correct or delete on our side — we hold no record that you were ever here.
Contact
Questions about any of this: [email protected]