July 25th, 2026: At some point in the next few days, I will be moving this website to a new server. The website might be inaccessible for a few minutes during the migration. Thanks for your patience!
User Agent
Normally the HTTP header and the JavaScript value of the user agent should match, but if you're some l33t h4xx0r (or you're using certain extensions), they may differ.
This page provides both values, because... well, why not?
User-Agent HTTP header.
navigator.userAgent global value.