Free browser extension · Chrome
Every website you visit sells your browsing to advertisers — without telling you. Data Mirror shows exactly what's being sold, to whom, and what it's worth.
The numbers they don't want you to see
How it works
Once installed, just browse normally. Data Mirror does everything in the background.
Visit any website as usual. Data Mirror silently intercepts all outgoing network requests in real time.
Each request is matched against 38 Big Tech companies, 24 data resellers, and 1,000+ known tracking domains — entirely on your device.
A privacy score A→F, the estimated market value per visit, and how much you should have earned over 30 days. Everything stays on your device — we never see any of it.
Inside the extension
Raw data, beautifully presented. No fluff, just the truth about what's happening on every page you visit.
"Your data is being bought and sold thousands of times a day. You deserve to know by whom, for what, and how much it's worth."
Data Mirror was built because privacy should not be a luxury for tech experts. It should be visible, understandable, and actionable for everyone. We built a tool that tells you the truth — about every website you visit, in plain language, with no agenda.
— datamirror.eu · Privacy by design · Made in France 🇫🇷
Questions
Absolutely not. All analysis happens locally in your browser. Nothing is ever sent to our servers — we don't even have a server that collects user data. Everything stays on your device.
No. Data Mirror intercepts requests asynchronously — it never blocks or delays network calls. The analysis runs in the background without affecting page load times.
It's an educated estimate based on public market research (FTC, Cracked Labs, IAB RTB studies — last updated March 2026). The real-time advertising market is opaque by design, so we show a low/high range to reflect the uncertainty honestly.
Big Tech refers to major technology companies (Google, Meta, Amazon, etc.) whose infrastructure appears on most websites, often for legitimate purposes like maps or fonts. Trackers are specific domains known to profile users for advertising purposes, regardless of which company operates them.
Each grade reflects the overall privacy exposure of a page, scored out of 100. A (85–100) — Excellent: very few trackers, data stays mostly in the EU. B (70–84) — Good: minor third-party exposure. C (55–69) — Fair: several trackers or data leaving the EU. D (40–54) — Concerning: multiple high-risk trackers. E (20–39) — Poor: heavy tracking, resellers active. F (0–19) — Critical: extreme exposure, data sent to high-risk regions.
Install in 30 seconds. Discover where your data really goes.
Add to Chrome — FreeNo account required · Privacy by design · Made in France 🇫🇷