Free tools
Free Privacy and Ad Blocking Tools
Ten tools for testing what your browser blocks, what a website loads behind the content, and what your setup gives away. All free, no signup, and no result is ever logged.
Blocking tests
Check what your ad blocker, DNS or browser actually stops.
Ad Blocker Test
Check whether your ad blocker is actually blocking
Open tool →YouTube Ad Block Test
Test the ad domains YouTube actually uses
Open tool →DNS Blocking Test
See whether blocking happens at your network level
Open tool →Filter Rule Generator
Build and validate blocking rules without memorising syntax
Open tool →Privacy checks
See what your browser reveals about you before you change anything.
Site inspection
Point these at any URL to see what it loads behind the content.
Tracker Scanner
See every tracker a website loads
Open tool →Extension Permission Checker
Find out what a browser extension can actually do
Open tool →Anti-Adblock Wall Detector
Check whether a site blocks ad blocker users
Open tool →Cookie Banner Check
See whether a cookie banner does what it claims
Open tool →Ad Blocking Speed Impact
Measure what the ads on a page actually cost you
Open tool →Why we built these
Most tools in this category are built by companies whose business is the thing being measured. An ad blocker test run by a company selling an ad blocker has an obvious incentive to make your current setup look bad, and a tracker scanner run by a consent vendor has an obvious incentive to find problems that its product solves.
We publish the ad blocker, so the same criticism applies to us. Our answer is to make the measurement inspectable rather than ask you to trust it. The tracker signature database these tools run on is public and versioned, the extension itself is open source, and every browser-side tool here runs entirely on your machine with no result transmitted. Where a tool needs a server, it says so on the page.
Which tool answers which question
| Question | Tool |
|---|---|
| Is my ad blocker working at all? | Ad blocker test |
| Why do I still get YouTube ads? | YouTube ad block test |
| Is my Pi-hole actually filtering? | DNS blocking test |
| How identifiable is my browser? | Browser privacy check |
| What does this website track? | Tracker scanner |
| Is this extension safe to install? | Extension permission checker |
| Does this site block ad blocker users? | Anti-adblock detector |
| Does this cookie banner actually work? | Cookie banner check |
| What do the ads on this page cost me? | Speed impact |
| How do I write a blocking rule? | Filter rule generator |
Using these tools elsewhere
The tracker signature database is released under CC0, which means you can use it in your own project without permission or attribution. If you are building something similar we would rather you started from our data than rebuilt a worse copy of it.
Frequently asked questions
Are these tools really free?
Yes. There is no signup, no account, no paid tier and no usage limit beyond a rate limit that stops automated abuse. Nothing here is a trial for a paid product.
Do these tools store my data?
The five browser-based tools run entirely on your machine and transmit nothing at all; you can confirm that in your browser developer tools. The five that scan a URL you enter send only that URL to our server, and the result is cached for a few hours so a popular site is not fetched repeatedly. No fingerprints, scores or personal data are stored.
Which tool should I use to check if my ad blocker works?
The ad blocker test. It fires live requests at more than 100 real advertising and tracker domains and reports which ones your setup let through, scoring network blocking and element hiding separately.
Can I use your tracker data in my own project?
Yes. The tracker signature database behind every tool here is published under CC0, which means you can use, modify and redistribute it without permission or attribution.