--- title: "Browser check" description: "A free, account-free measurement of how a browser looks from the outside: how many things give it away, weighted from one to four, with the reasoning behind each one." canonical: "https://scalebrowser.net/check" last_modified: "2026-10-04T12:55:10.000Z" --- > ## Documentation Index > Fetch the complete documentation index at: https://scalebrowser.net/llms.txt > Use this file to discover all available pages before exploring further. # Browser check A free, account-free measurement of how a browser looks from the outside. Open the page and it measures at once: no sign-up, no click, no cookie. The headline figure is how many things give you away, not how coherent the browser is. A browser can be perfectly coherent and still be recognised, which is exactly what happens to a scripted Chrome: the browser is genuine, the control layer above it is not. Contract version: chk-4. Every result carries it, and no shared result is ever recomputed under a later one. ## What is checked 12 groups, 59 checks. Each group states one claim about the visitor and is judged coherent, contradicted, held back or not testable. | Group | The claim it checks | Checks | |---|---|---| | Operating system | which operating system this machine runs | 6 | | Browser engine | which engine opened this connection | 4 | | Browser version | which version of that browser this is | 2 | | Time zone | which time zone this machine is set to | 3 | | Languages | which languages this browser asks for | 2 | | Display | what kind of display this is | 8 | | Input device | what you point with | 1 | | Machine | what this machine is | 4 | | Rendering | what draws this page | 3 | | Connection quality | what your browser says about your connection | 1 | | Automation surface | whether this browser is being driven | 14 | | Where the connection comes from | which network this connection leaves from | 3 | ## How a finding is weighted Four levels. The heaviest one present decides how serious the result is; they do not add up, because one impossible value says more than ten merely uncommon ones. | Level | Reads as | Meaning | |---|---|---| | 4 | names your tool | The value contains the name of an automation tool. | | 3 | impossible on real hardware | No device reports this value, or two values contradict. | | 2 | someone changed this | The value carries a trace of being replaced. | | 1 | rare, but real | Uncommon and entirely possible. | ## What this page does not measure It reads the browser, not the tool driving it. Typing rhythm, pointer paths and the structure of input events belong to the second page: https://scalebrowser.net/ai-agent-check. Point an agent at that address and it measures the agent itself. ## Related tools on the same site - https://scalebrowser.net/check: this page - https://scalebrowser.net/ai-agent-check: measures how an agent types and clicks - https://scalebrowser.net/check/user-agent: the user agent string and whether three other sources back it up - https://scalebrowser.net/check/proxy: whether a site can tell the connection runs through a proxy or VPN - https://scalebrowser.net/check/captcha: whether real captchas let the browser through, confirmed by the provider - https://scalebrowser.net/check/webrtc: which addresses a browser reveals over WebRTC - https://scalebrowser.net/check/timezone: time zone against the network exit - https://scalebrowser.net/check/dns-leak: which resolver answers for this connection - https://scalebrowser.net/check/client-hints: the headers a browser sends about itself - https://scalebrowser.net/check/connection: the TLS fingerprint (JA4, JA3 across two connections), HTTP/2 profile and header order - https://scalebrowser.net/check/network: what the address itself says - https://scalebrowser.net/check/badge: turn a result into an image for a README ## What is stored No IP address, no cookie, no identifier for the visitor. Aggregate counts per measured value, so the page can say how rare a value is. A shared report exists only when the visitor asks for one. The full record is at https://scalebrowser.net/legal/privacy.