What is tested?
A good ad blocker may combine DNS blocking, browser request blocking, cosmetic filtering and privacy protections. This tester checks the parts a normal web page can observe safely.
Important limits
Browsers cannot directly query your DNS resolver or prove that every tracker on the internet is blocked. Results are a practical benchmark, not a legal or security certification.
Details
Results
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Adblock check for modern ad blockers, DNS filters and tracker blockers
Adblock Tester is designed for users of browser extensions and DNS-level blockers such as uBlock Origin, AdGuard, Pi-hole, NextDNS and similar tools. It combines script bait checks, cosmetic filter detection and live browser requests to high-signal advertising, analytics, telemetry, attribution and social tracking domains.
The test is intentionally transparent: a blocked request improves the score, an open request lowers it, and every domain is shown by category and service so false positives or network-specific issues can be reviewed.