Privacy

Private Click Measurement

Apple PCM API

Live Playground

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API Docs

Endpoint

GET /api/fingerprint/private-click-measurement

Examples

About

Private Click Measurement (PCM) fingerprinting detects Apple's privacy-preserving ad attribution API via checking for HTMLAnchorElement.prototype.attributionSourceId. This API is Safari/WebKit-exclusive (iOS 14.1+, macOS Safari 14.1+), making it a strong Safari and Apple ecosystem indicator. The API provides ad attribution without third-party cookies, replacing traditional cookie-based tracking. PCM support indicates Safari browser, Apple device, and relatively recent OS version. Adoption matches Safari's market share (15-20% globally, higher on mobile). This creates a binary signal with moderate entropy but strong platform indication.

Use Cases

•Safari detection
•Apple device identification
•Privacy-preserving attribution
•WebKit indicator

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Core pages

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