Privacy
What runs where
Every calculator runs in your browser. The numbers you enter, and any text you paste into a tool, are not sent to a server. Result links put your inputs in the page address so you can share them; sharing a link shares those inputs.
What is recorded
Two anonymous events: a page view when a page loads and a tool run the first time a calculator is used on a page. Each carries the page path, the tool name and whether Pro is on. The receiving service (our own, hosted on Cloudflare) keeps a daily visitor hash to count unique visitors and does not store IP addresses or set cookies. There is no account and no profile.
Licence keys
If you buy Pro, Polar (the merchant of record) processes the payment and emails a licence key. The key is stored in your browser's local storage and checked against our licensing service once a day. Saved scenarios are stored in your browser only and never uploaded.
Support
The support form sends your email address and message to our support service, which answers from documentation or forwards to a person. Messages are kept to resolve the thread and deleted within a year. Cloudflare Turnstile protects the form; it may set a cookie on challenges.cloudflare.com.
Advertising
Free pages may show advertising served by Google AdSense once the site is approved for it. Google and its partners use cookies to serve ads based on prior visits to this or other websites; you can opt out at Google Ads Settings or aboutads.info. Pro removes advertising. Until approval, no ad script loads.
Affiliate links
Some recommendation boxes carry affiliate links; each box says whether it does. Clicking one lets the vendor pay us a commission at no cost to you. No personal data is passed to the vendor by us.
Hosting
The site is served by Cloudflare, which processes connection data (such as IP addresses) to deliver pages and defend against abuse, under its privacy policy.
Your rights and contact
Because no personal data is stored about free use, there is nothing to export or delete beyond your own browser storage. Pro buyers can ask for their support thread and licence record through the support form. Norwell Systems LLC, United States.