Privacy
Privacy policy
Last updated: September 2026
We collect as little as the site can run on, and we do not sell personal information.
What our tools collect
Calculator inputs are processed in your browser. When you type figures into a tool on this site, those values are used to render your result and are not transmitted to us or stored on our servers.
Analytics
We use Cloudflare Web Analytics, which reports aggregate counts of page views, referring sites, and country-level location. It sets no cookies, uses no client-side state to follow you between sites, and does not sample your IP address into a profile. We do not build advertising profiles of individual visitors, and there is no Google Analytics on this site.
If you give us an address, we store it in a database we control (Cloudflare D1), together with the page you submitted it from and the country you were reading about. We store nothing else. We do not sell or rent the list, and we do not pass it to an advertising network.
In the interest of being accurate rather than aspirational: at the time of writing, nothing sends mail from this list yet. When that changes, this section will name the provider before the first message goes out, and every message will carry a one-click unsubscribe. To be removed before then, contact us and we will delete the row.
Affiliate and referral links
Some outbound links are affiliate or referral links. When you follow one, the destination company may set a cookie to attribute the referral to us. That happens on their side, under their privacy policy, not ours. See our disclosure for how this works commercially.
Cookies
This site sets no advertising or tracking cookies of its own, and the analytics described above are cookieless. Your browser can block or clear cookies at any time and every tool here will still work, because the calculators run entirely in the page. If display advertising is ever introduced, ad networks set their own cookies, and this section will be rewritten before that happens.
Your choices
Depending on where you live, you may have the right to request access to, correction of, or deletion of personal information we hold about you, and to opt out of its sale, which is straightforward here because we do not sell it. To make a request, contact us and we will act on it.
Children
This site is intended for adults making purchasing decisions. We do not knowingly collect personal information from children.
Changes
If this policy changes materially, we will update the date at the top and describe what changed.