What Operating System Do I Have
See your operating system and version, read from your user agent string.
100% private, runs in your browser
Read from your browser's user agent string — not always precise (some browsers send a generic user agent for privacy). Nothing is sent to a server; this is read and shown entirely in your browser.
What is What Operating System Do I Have?
Reads your operating system (Windows, macOS, Android, iOS, or Linux) and version straight out of your browser's user agent string — a quick check without digging through system settings.
FAQ
It's read directly from what your browser reports, which is generally reliable — though some browsers increasingly send a generic user agent for privacy, which can limit the detail available.