Privacy
Short version: no accounts, no personal information, no cookies from us. What you type into a calculator stays on your device.
What stays on your device
Calculators save what you enter (for example the pets in your pen) in your browser's local storage, so it's still there next time. It never leaves your device. Clearing your browser data deletes it.
Share links
A share link carries your entries inside the link itself, after the # sign. Browsers don't send that part to our server. Whoever you give the link to can see those entries.
Visit counts
We count page views with Vercel Web Analytics. It uses no cookies and doesn't identify you. It records things like which page was viewed, the referring site, the country, and the browser and device type. We use it only to see which tools are useful.
Ads
There are no ads yet. If we add Google AdSense, ad requests will be tagged for child-directed treatment and set to non-personalised, so ads won't be based on your past behaviour. This page will be updated before any ads go live.
Children
GrindMath is for a general audience that includes children. We don't knowingly collect personal information from anyone, and there's nothing to sign up for.
Hosting
The site is hosted on Vercel. Like any web host, Vercel processes basic request data, such as IP addresses, to deliver pages and stop abuse.
Contact
Questions about privacy or a correction to any number: contact@econlearn.org.
Last updated 2026-10-04.