System

CPU Class

Legacy IE property

Live Playground

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API Docs

Endpoint

GET /api/fingerprint/cpu-class

Examples

About

CPU class fingerprinting checks the deprecated navigator.cpuClass property, which was specific to Internet Explorer and returned values like 'x86', 'x64', 'ARM', 'PPC'. Modern browsers don't implement this property, so its presence indicates IE or very old browser versions. This creates a strong signal for legacy browser detection. Testing for cpuClass alongside other IE-specific properties (like navigator.browserLanguage, navigator.systemLanguage) creates an IE detection profile. Modern browsers return undefined.

Use Cases

•IE detection
•Legacy browser
•Old version identification
•Enterprise environment

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Core pages

Browser Fingerprinting PlatformRun a privacy-first browser fingerprint check and learn what websites can infer about your device.Fingerprint CheckerTest your browser privacy with a live fingerprint scan, collector coverage, and privacy leakage analysis.IP Risk CheckerCheck IP risk, ASN, geolocation, proxy, VPN, Tor, datacenter, and routing signals through the CreepJS API.Browser Fingerprint SignalsBrowse the full CreepJS library of browser fingerprinting signals, including canvas, WebGL, WebRTC, fonts, storage, and privacy checks.DocumentationRead the CreepJS API, SDK, collector, and integration documentation for privacy-first browser fingerprinting.API PlaygroundGenerate a token, inspect sample payloads, and test CreepJS browser fingerprinting API calls.What Is Browser Fingerprinting?Learn how browser fingerprinting works, which signals are collected, and how privacy tools reduce tracking.

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