Privacy

Short version: this is a small, independent tool. It isn't trying to know who you are, and there's nothing to sell you. Here's exactly what does and doesn't happen with your data.

The calculator

Every number you enter stays in your browser. There's no account, no login, and nothing you type into the calculator is sent to a server. The "Create shareable link" button encodes your inputs directly into the URL — that link is the only way a scenario travels anywhere, and only if you choose to send it.

Cookies

The site doesn't set cookies. The light/dark theme toggle, and your progress through the simplified questionnaire if you use it, are remembered using your browser's local storage, not a cookie — both stay on your device and are never transmitted anywhere.

Hosting & delivery

Like effectively every website, this one runs on infrastructure that has to process basic connection information to deliver pages at all: your IP address, the page requested, a timestamp, and your browser's user agent. That happens here through Cloudflare (CDN, DNS, and abuse protection) and the hosting provider. Neither is used for anything beyond serving the site and defending it from abuse — see Cloudflare's own privacy policy for how they handle it.

Analytics

If traffic analytics are enabled on this site, they're privacy-respecting by design: no cookies, no device fingerprinting, and no tracking of you across other sites. At most they report aggregate patterns — which pages get visited, roughly how, and from where — never a profile tied to you. There is no Google Analytics, no ad pixel, and no retargeting tag anywhere on this site.

The contact form

The contact form emails your name (if you give one), your email address, and your message directly to my inbox using the server's mail function. That's it — there's no database behind it, nothing is added to a mailing list, and it isn't shared with or sold to anyone. Two ordinary anti-spam checks run on submission (a hidden field real visitors never fill in, and a minimum time before submit) — neither collects anything beyond what's already in the form.

Third parties

The full list: Cloudflare (CDN, DNS, security) and the web host that serves the files and delivers contact-form email. No ad networks, no trackers, no data brokers, and no data is sold to anyone, ever.

Changes

If how this site handles data ever changes, this page changes with it. Last updated 2026-09-12.

Questions about any of this? Get in touch.