Detection runs client-side in your browser. Values like browser, user agent, screen size, timezone, and language are read by JavaScript and shown only on the page you are viewing.
uname.fyi does not use cookies, localStorage, analytics, ads, fingerprint logging, a backend app, or a database. It does not store or remember the browser information shown here.
The only external recipient is ipwho.is. Your browser calls https://ipwho.is/ directly to look up your visible IP address, city, and ISP. uname.fyi does not proxy or store that response.