Every measurement a website can take from your browser, run live and shown back to you. This is the same class of signals the tracking and anti-fraud scripts collect — surfaced instead of hidden.
audio-fp probe—
Your IP
resolving…
1 Hardware & environment
cross-engine · links you across different browsers
…
2 Engine × hardware
canvas · audio · math · codecs — links within one engine family
…
3 Browser build
which browser & version — not who you are
Paste a JSON report from another browser or session (Copy JSON report → paste here). GlassBox scores each tier and tells you whether it's the same machine, same engine family, or same browser — the way a real cross-browser tracker links you.
Mostly local. Every fingerprinting probe runs in your browser and stays here — no analytics, no beacon. The one exception is IP intelligence: on load, GlassBox queries public geolocation APIs (ipwho.is, ipapi.is) to look up your address, network and VPN status. Turn Geo off in the toolbar to stay fully local. View source to confirm the rest.