Short version: no cookies, no account, no tracking of you as an individual, and your grades never leave your device.
Your grades stay on your phone
The calculator runs entirely in your browser. What you type is never sent anywhere.
Your entries are saved in your browser's local storage so that coming back later does not mean typing everything again. That storage is on your own device and nobody else can read it. The Clear button in the calculator deletes it.
If you use Copy link, your grades are put into a web address so you can send it to somebody. That happens only when you press the button, and only you decide who gets the link.
Cookies
None are set. That is why there is no cookie banner asking you to accept anything.
Analytics
If analytics are running, they are cookieless and count page views without building a profile of you or following you between sites. No Google Analytics, no advertising pixel, no ad network.
This is a deliberate choice rather than a technical accident. Much of the audience here is under eighteen, and the right answer for a site aimed at teenagers is to collect as little as possible.
What is not here
No account system. No email signup. No newsletter. No advertising. Nothing is sold, and no data is shared with anyone, because there is none to share.
Getting in touch
Questions about any of this go to hello@onoirstudio.com. The site is run by Onoir Studio Limited, an Irish registered company.