snitchtest vs eff cover your tracks
EFF's Cover Your Tracks — the 2020 evolution of Panopticlick — is the canonical research tool for browser-fingerprint uniqueness. It answers one question well: how rare is your browser compared to a corpus of millions. SNITCHTEST answers a different question: what every leak vector on your browser actually reveals, including signals EFF does not measure. Both are legitimate. They are complementary, not redundant.
Summary table
| dimension | SNITCHTEST | Cover Your Tracks |
|---|---|---|
| primary measurement | every leak vector (25+) plus backend probes | fingerprint uniqueness vs EFF corpus |
| uniqueness score | rough entropy estimate | canonical (1 in N from EFF's research dataset) |
| WebRTC leak | yes (local + public IP check) | no (not part of the uniqueness measurement) |
| DNS / server-observed IP | yes (Cloudflare edge view) | no |
| TLS fingerprint signals | yes (version, cipher, header order, UA agreement) | no (client-side JS only) |
| tracker-blocking effectiveness | ad-tech detection (adblocker presence) | yes (tests whether known trackers load) |
| academic credibility | (new, 2026) | EFF research project, widely cited |
| shareable score | text stream, no single "grade" | structured result page, shareable URL |
| best for | full leak audit, VPN verification, backend-layer signals | knowing how unique your browser is, tracker-protection testing |
What Cover Your Tracks does better
Corpus-relative uniqueness. EFF has collected fingerprint data from millions of visitors since 2010 (originally as Panopticlick). When Cover Your Tracks tells you "your browser is unique among the last 150,000 visitors" or "1 in 200,000 browsers share your fingerprint," that claim is backed by actual data. SNITCHTEST shows entropy bits but cannot compare against a maintained visitor corpus.
Tracker-blocking effectiveness. Cover Your Tracks attempts to load known tracker resources (fingerprinting scripts, ad-network scripts, known invasive domains) and tells you whether your defenses blocked them. This is how you verify a new ad blocker, tracker-protection extension, or DNS filter actually catches what it claims. SNITCHTEST detects adblocker presence (yes/no) but does not run a full tracker-load test — that's what piholekiller.com is for in the same network.
Research credibility. Cover Your Tracks is EFF's research project. Results from it appear in academic papers, privacy advocacy, and news articles about fingerprinting. For a citation in a research context, Cover Your Tracks has institutional weight no independent tool matches.
What SNITCHTEST does that Cover Your Tracks doesn't
WebRTC leak detection. SNITCHTEST actively probes WebRTC for both local LAN IP leaks and public IP leaks through VPNs. Cover Your Tracks does not measure WebRTC — it's outside the fingerprint-uniqueness research scope. For VPN verification, SNITCHTEST is the relevant tool.
Server-observed backend probes. SNITCHTEST includes a Cloudflare Pages Function that records the TLS version, cipher, HTTP protocol, TCP round-trip time, and request header ordering — all things the server sees but client-side JavaScript cannot. Cover Your Tracks runs entirely client-side.
UA-vs-headers spoof detection. SNITCHTEST flags User-Agent spoofing by cross-checking the UA string against the actual request header pattern. A UA claiming Chrome but missing sec-ch-ua is detected as forged. Cover Your Tracks does not perform this cross-check.
Geo-vs-timezone consistency. SNITCHTEST flags when the server-observed IP country disagrees with the browser's reported timezone — a signal that either a VPN is active or the browser is spoofing locale. Cover Your Tracks doesn't measure this.
Use the right tool for the question
"How unique is my browser among all browsers?" — use Cover Your Tracks.
"Is my browser leaking anything?" — use SNITCHTEST.
"Is my new VPN actually hiding my IP?" — use SNITCHTEST (WebRTC + server-observed IP).
"Does my tracker-blocking extension stop known trackers?" — use Cover Your Tracks (or piholekiller.com for ad/tracker gauntlet).
"Is my User-Agent convincingly spoofed?" — use SNITCHTEST (UA-vs-headers check).
"I'm writing a research paper on browser fingerprinting" — cite Cover Your Tracks; SNITCHTEST as a supporting non-academic reference.
FAQ
What's the difference between SNITCHTEST and Cover Your Tracks?
Cover Your Tracks measures one thing well: how unique your browser fingerprint is compared to EFF's corpus of millions of visitors. SNITCHTEST measures more dimensions (WebRTC, DNS, server IP, TLS, header ordering) but does not compute a corpus-relative uniqueness score. For "am I unique" Cover Your Tracks is canonical; for "what is my browser leaking" SNITCHTEST is broader.
Is Panopticlick the same as Cover Your Tracks?
Cover Your Tracks is the 2020 rebrand and evolution of the original Panopticlick tool, both built by EFF. The URL panopticlick.eff.org now redirects to coveryourtracks.eff.org. Methodology has been refined (tracker-protection effectiveness is now a first-class metric); the underlying fingerprint-uniqueness research project is the same.
Which is better for testing if my VPN works?
SNITCHTEST. Cover Your Tracks focuses on fingerprint uniqueness, which a VPN does not affect (canvas hash is the same with or without a VPN). SNITCHTEST tests WebRTC leak, server-observed IP vs browser-reported IP, and geo-vs-timezone consistency — all of which directly indicate whether a VPN is doing what you expect.
Does Cover Your Tracks measure anything SNITCHTEST does not?
Yes: a corpus-relative uniqueness score (1 in N browsers) backed by EFF's research dataset. SNITCHTEST shows entropy bits and a rough profile count but does not compare against a maintained visitor corpus. For a research-grade uniqueness claim, Cover Your Tracks is the reference.
Try both
Related reading: The Dossier Your Browser Hands Out for Free · How to Actually Stop Fingerprinting · SNITCHTEST vs BrowserLeaks · Privacy Glossary