d4 · tools · trackers
Enter a page and our server fetches it once, then reads the source the way a browser would: every advertising pixel, analytics beacon, session recorder, fingerprinter and social hook it finds is traced back to the company that receives the data. Inspired by tools like The Markup's Blacklight; this one runs entirely on our kit and keeps nothing.
How it works: our server fetches the page once (headers and up to 2 MB of HTML, redirects followed and re-checked hop by hop), then reads the source for scripts, pixels, iframes, preconnect hints and tracker bootstrap code, and matches every third-party domain against a hand-curated database of tracking companies. No JavaScript is executed, so trackers that are only injected at runtime (typically via tag managers) will not appear: treat the results as the minimum a real visit would trigger. The tool only ever connects to publicly routable addresses and is rate limited. Nothing you scan is logged or stored.