Privacy

The calculators run entirely in your browser. We do not collect the numbers you type, and we do not require an account to use the free tools.

If you buy a kit, payment is processed by the checkout provider (Gumroad or another merchant of record). Their privacy policy governs card data, invoices, and tax collection. We receive your email and order details so we can deliver the files and handle support.

The public site may use privacy-respecting analytics later (for example, a cookieless counter). We will not sell your data. For deletion requests, email the address on your purchase receipt.