Every time you visit a website, your browser introduces itself. It hands over a digital business card listing your operating system, your software version, and your preferred language.
But here is the secret: Your browser is a liar.
Modern web browsers are suffering from an identity crisis. Chrome claims to be Safari. Safari claims to be KHTML. And the Facebook in-app browser? That’s a whole other level of surveillance drama.
WhoDis is a utility designed to cut through the noise. It is half developer tool, half digital toy.
For web developers and sysadmins, WhoDis provides a clean, no-nonsense look at the raw data flowing between client and server.
The Local Inspector: See the exact HTTP headers your device is broadcasting right now. Debug caching issues, verify your VPN is actually hiding you, or check if your custom User Agent string is being passed correctly.
The Remote Inspector: Need to check a server's response code without actually visiting the site? Enter any URL to fetch its headers from the server. It’s perfect for:
If you aren't debugging a server, you can still have fun judging your browser.
WhoDis analyzes your User Agent (UA) string – the messy text string your browser sends to identify itself – and run it through a "Lie Detector."
This tool exists in part because the history of the web is a history of compatibility wars.
In the early days, websites would only let you in if you were "Mozilla" (Netscape). So, when Internet Explorer came along, it started pretending to be Mozilla to get in the door. When Chrome launched, it pretended to be Safari (WebKit) to ensure pages rendered correctly.
Today, your User Agent string is a historical artifact of 30 years of browser warfare. WhoDis helps you read that history.