How to test an antidetect browser

• Use a new profile with the proxy you will really use. A test without the proxy tells you little.
• Turn off extensions that you added yourself. They can change results.
• Test on the computer and OS where the profiles will run.
• If the browser has more than one engine, test each engine.

1. IP and proxy: check that the IP is the proxy’s exit IP, and note its network. A data center network looks different from a home connection. Fix: use the proxy type your sites expect.
2. WebRTC: check that WebRTC shows no second public IP from another network. Fix: make WebRTC use the proxy, not a direct route.
3. DNS: check that the DNS resolver is in the same country as the IP. Fix: let the proxy resolve names, for example with SOCKS5 and remote DNS.
4. Time zone and language: check that the clock and the language list fit the IP location. Fix: set both from the proxy location.
5. TLS fingerprint: check that the JA4 and HTTP/2 fingerprint fit the engine that the user agent names. Fix: show only an identity that the real engine can back.
6. Automation: check for navigator.webdriver, automation variables and debugger reads. Fix: use an automation setup that leaves none of these in the page.
7. Replaced functions: check that built-in functions are still native. A script that replaces them leaves traces. Fix: change values inside the engine, not with page scripts or extensions.
8. Noise: check canvas, WebGL and audio for noise that a site can detect. A plain colour must read back exactly. Fix: use a stable value per profile, not random noise.
9. Fonts vs OS: check that the fonts fit the OS that the profile claims. Fix: do not claim an OS whose fonts the computer does not have.
10. Engine and user agent: check that the user agent version matches the JavaScript features of the engine, with no tokens that a stock browser lacks. Fix: use a browser that keeps its engine current.
11. Two profiles: open two profiles and compare their canvas, WebGL and audio fingerprints. They must differ. Fix: give each profile its own fingerprint.

On 2026-11-03, we ran our live test inside several other antidetect browsers. The results show what the steps above catch. They are examples, not a ranking, and vendors update often.

• Old engines (step 10): the free CloakBrowser build ran engine 146, and AdsPower’s FlowerBrowser ran 153. In the same week, we tested stock Chrome 156.
• Wrong version claim (step 10): DICloak’s user agent claimed version 147, but the JavaScript features matched a 142 engine.
• Detectable noise (step 8): CloakBrowser and DICloak showed noise in canvas, WebGL or audio output. GoLogin showed audio noise.
• Foreign token (step 10): GoLogin’s user agent had an “AVG/147” token, which a stock Chrome user agent does not have.

A checker is only as good as its rules. Some flag things that every normal browser does. On 2026-11-02, Pixelscan showed “Timezone spoofed” for stock Chrome 156, although its time zone matched the proxy exit. In our October 2026 benchmark, every product and all 12 stock Chrome controls got that label on 12 proxy IPs. So the label follows the proxy, not a wrong clock.

Iphey showed “Detected an inconsistent browser fingerprint” for a returning profile whose screen size or GPU changed between visits. Fresh profiles were not flagged, and clearing that site’s data reset it. This is a real lesson: a profile must keep the same values on every visit.

Our test fails a check only for a value that a stock browser never shows. Stock Chrome, Edge and Firefox on Windows, macOS and Linux pass, and we check this every week. Things that normal setups cause are warnings.

After the checkers, the real test is the site you work on. Watch each new profile for extra captchas, phone checks or login challenges.