Desktop client hints are filled in, not left blank
On desktop Chromium: brands is not empty, and platform, architecture, bitness, platformVersion and uaFullVersion are non-empty strings. N/A on mobile and where userAgentData is unavailable (severity: warn).
What a detector infers
Desktop Chrome always fills navigator.userAgentData: a brand list, a platform, and the high-entropy hints architecture, bitness, platformVersion and uaFullVersion. They go blank when the user agent string is overridden without client-hint metadata, as a driver's setUserAgent(string) or the DevTools protocol's Emulation.setUserAgentOverride without userAgentMetadata do: the brand list empties and platform becomes an empty string.
The other client-hint rows compare values against each other, and empty lists agree with anything, so this row checks that the values exist. Measured on 2 November 2026 on Windows: genuine Chrome 156 and Clearcote fill every field.
How to resolve it
Override the user agent together with its client-hint metadata (userAgentMetadata), or not at all.
Nearby checks in Navigator identity
- getLayoutMap behaves like a browser IPC, not a script
keyboard-layout-map-semanticsnavigator.keyboard.getLayoutMap() is not computed in the page: it asks the browser process for the current layout over IPC and resolves when… - navigator.platform ↔ UA ↔ UA-CH platform agree
platform-coherenceThree independent surfaces each name an operating system, and this check normalises all three to one family (win / ios / mac / lin) and… - UA-CH brand version matches the UA Chrome version
uach-ua-versionThe check extracts the major from Chrome/(\d+) in the UA string, finds the Chrome or Chromium entry in navigator.userAgentData.brands, and… - UA-CH high-entropy hints cohere with the UA
uach-highentropyThis awaits navigator.userAgentData.getHighEntropyValues and compares the richer hints against the UA string on three axes, collecting every… - Every brand in a UA-CH list uses the same version format
uach-brand-version-arityUA-CH publishes the same brand set twice at two precisions. navigator.userAgentData.brands carries bare majors like "148", and the… - navigator.language === languages[0]
languages-coherenceIn a real browser navigator.language is defined as the first element of navigator.languages — one preference list, two views onto it. - The host voice roster represents the language the browser claims
locale-vs-voice-coherenceThe voice roster is installed at the operating-system level and the language preference is set in the browser, so the two are genuinely… - eval.toString().length matches the engine (V8 = 33)
etslThe string a JS engine returns for a native function's source is an implementation detail, and its length differs per engine…
Clearcote is a browser built for fingerprint coherence
It is a Chromium fork, maintained by the same people who wrote this reference. It ships as a compiled browser rather than as a stealth script injected into someone else's — which is a description of how it is built, and is not an argument about how it behaves on this check.
This audit takes no position on how Clearcote scores on Navigator identity checks, on this one, or anywhere else. It has no baseline corpus of other people's fingerprints to rank you against and no vendor scoreboard — nearly every check is self-referential, asking one browser the same question through two independent APIs and reporting whether both answers can be true at once. It runs identically on any browser, including ours. Run it on yours and read the result yourself.
See the other checks in Navigator identity — the family uach-not-blank belongs to.