Glassbox shows you exactly what your browser hands to every site you visit: canvas and WebGL fingerprints, fonts, timezone, hardware signals, WebRTC IP leaks, and the trackable combination they form. Everything runs in your browser. Nothing is uploaded, stored, or sent anywhere. Built by a security engineer who wanted to see his own fingerprint the way trackers see it, then fix it. Open source, no account, no backend. Open the box, see what's leaking, close the gaps.

Hey Product Hunt 👋 I'm David, security engineer by day, HotStart Labs by night. Glassbox is the tool I wanted for myself: a clear look at what my own browser gives away to every site I load, without having to trust yet another privacy service with the data. What it does: opens up the signals that make up your browser fingerprint (canvas, WebGL, fonts, timezone, hardware, WebRTC) and shows how unique the combination is and where the leaks are. Everything runs client-side. No account, no upload, no backend to breach. The code is open, so you can verify that yourself. Why I built it: most fingerprinting checkers are run by companies whose business is fingerprinting. I wanted one with no incentive to keep the results. I'd love to hear which signals surprised you, what your browser scored, and what you'd want added next. Happy to answer anything about how it works under the hood.

Maker here. GlassBox runs 30+ live fingerprinting checks against your browser and scores how identifiable the result makes you, measured against the ~33 bits of information it takes to single out one person on Earth. Everything runs locally in your tab, nothing is sent anywhere.

Try it: https://glassbox.codecanary.org

Source: https://github.com/HotStartLabs/...

Try it: https://glassbox.codecanary.org

Source: https://github.com/HotStartLabs/...

GlassBox

See what your browser is leaking. Fix it.

See what your browser is leaking. Fix it.

Forum Threads

What did GlassBox catch your browser leaking?

Forum Threads

What did GlassBox catch your browser leaking?