Privacy
Short version: what you type stays on your device.
Your numbers
Every calculator and developer tool on do-the-math runs in your browser. Loan amounts, body measurements, JSON, tokens, keys and anything else you enter are processed on your device and are not sent to our servers.
Links you share
Calculator pages keep your inputs in the page address so you can bookmark or share a result. Anyone you send that link to will see those numbers. The developer tools never put what you paste into the address.
What your browser remembers
We use your browser’s local storage for a few conveniences: your theme, your currency, the details you enter in the health calculators, and the tape of recent calculations. This stays on your device. Clear your browser’s site data to remove it.
Server logs
Like any website, our web server records standard request logs, such as the page requested, the time, and your IP address, to keep the site running and secure. They don’t include anything you type into a calculator.