Privacy
Short, because there is little to say: the calculators run in your browser and nothing you type is sent anywhere.
What is computed where
Every calculation happens in your browser using code delivered with the page. There is no server that receives your inputs, no account, no cookies set by this site, and no analytics script.
What a shared link contains
When you copy a link from a calculator, the numbers you typed are encoded after the # in the address (for example #i=2022-05&a=10000). Browsers do not send that part of an address to any server, so a copied link stays on your device until you choose to share it. Never include anything identifying in it — the tools do not accept names or account numbers.
What is stored on your device
One value: your light/dark theme choice, in your browser’s local storage under the key th:theme. Nothing else. Clearing site data removes it.
Hosting
The site is served by Cloudflare Pages. Like any web host, Cloudflare processes connection metadata (such as IP address and requested URL) to deliver pages and defend against abuse, under its own privacy policy. This site has no access to, and keeps no copy of, that data.
Changes
If any of the above changes — for example if advertising is added — this page and the disclosure page will be updated first.