Free browser extension
Every website sends your data to dozens of companies around the world — without telling you. Data Mirror makes it visible, in real time.
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 a database of Big Tech companies, ad brokers, and known trackers — entirely on your device.
The dashboard shows you countries, companies, trackers, a privacy score A→F, and even the estimated market value of your data.
Inside the extension
Raw data, beautifully presented. No fluff, just the truth about what's happening on every page you visit.
Our philosophy
Your data is yours. You deserve to know who has it, where it goes, and what it's worth.
Data Mirror was built on a simple conviction: transparency is not a feature, it's a right. Every request your browser makes is a tiny piece of your identity being shared — often without your knowledge, always without real consent. We built this tool to give that visibility back to you, with zero compromise on privacy: nothing is ever collected, stored on our servers, or shared with anyone.
— datamirror.eu · Privacy by design
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 fonts or maps. 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, nothing critical. C (55–69) — Fair: several trackers or data leaving the EU, worth checking. D (40–54) — Concerning: multiple high-risk trackers or significant data sent abroad. E (20–39) — Poor: heavy tracking, ad brokers active, sensitive countries involved. F (0–19) — Critical: extreme tracking exposure, data sent to high-risk regions.
Install in 30 seconds. Discover where your data really goes.
Add to Chrome — freeAlso available for Firefox · No account required · Privacy by design