A live, in-browser look at what any website can learn about you the moment you visit — on any device (yes, including this phone), no app, no install.
Runs entirely in your browser · sends nothing anywhereMost privacy advice is abstract. Glasshouse explains a thing, then demonstrates it on you — so it stops being theoretical. Tap each Show me button below. Everything happens locally; this page makes no network calls of its own.
You don't need cookies to be tracked. The exact mix of your screen, fonts, GPU, timezone and settings is often unique enough to single you out across sites — silently. Here's yours, computed live:
🧒 Like you're 5: Everyone wears a different mix of hat, socks and shoes. Even with no name tag, people spot you just by your outfit. Your browser wears an outfit too — and websites recognise it.
Sites can ask your browser to draw a hidden image, then read it back. Tiny differences in your GPU/driver/OS can make the result reliably you — a classic cookieless trick. It works fully in Chrome; Safari, Firefox and Brave now add noise to defeat it, so on those you may get a different result each run. Let's see yours:
🧒 Like you're 5: We ask your computer to doodle a tiny picture. It draws it just a little differently than everyone else — like handwriting. So the doodle alone whispers "this is you."
Through WebGL, a page can often read the name of your GPU — another identifier you never agreed to share. Chrome shows the exact model; Safari reports just "Apple GPU" and Firefox generalizes it to limit this. Here's what this page can see:
🧒 Like you're 5: Your computer has a part that draws games and videos. When a website asks, it shouts its exact brand name across the room — like telling a stranger which toy you own.
The WebRTC feature used for video calls once leaked your device's local network address. Most
current browsers now mask it as a random .local name, so a raw-IP leak is the uncommon,
misconfigured case today (and this only ever exposed your local address, not your public/VPN IP). Let's see what yours shows:
🧒 Like you're 5: Your device has a secret house number on your home network. This trick can peek at it through the window — even when you thought the curtains (your VPN) were shut.
Cookies aren't the only memory. Let's write a marker to your browser's storage right now, then read it back — proof that a site can recognise a returning you:
🧒 Like you're 5: A website sticks a tiny sticky note on you. Next time you visit it reads the note and goes "oh, it's you again!" — even though you never told it your name.
Just by loading, this page learns a surprising amount — no permission prompts involved. Here's the raw picture:
🧒 Like you're 5: The moment you walk in, the website already notices your shoe size, the language you speak and what time it is where you live — without ever asking.
Each probe alone feels harmless. Stitched together, they're a profile — and profiles get used. Walk through your day one scene at a time, built from the exact values you saw above. At each step you get a choice — watch how the machine absorbs it either way. (Tip: run the probes above first so it's truly yours.)
🧒 Like you're 5: Lots of little clues about you get glued together into one big sticker that says "this person." Then companies use the sticker to sell you things and change your mind — and you never handed it over.
Opens full-screen — close it anytime to come back here.