Apple Releases Private Click Measurement to iOS 14.5

Safari WebKit

Apple is introducing a new technology called Private Click Measurement to iOS 14.5. It’s an attempt to give online advertisers a way to measure ads privately.

Private Click Measurement

The system tries to find a balance between tracking users via user/device IDs with some data reports.

At the same time, we want to support measurement of online advertising. PCM achieves this tradeoff by sending attribution reports with limited data in a dedicated Private Browsing mode without any cookies, delaying reports randomly between 24 and 48 hours to disassociate events in time, and handling data on-device.

  • An 8-bit identifier on the click source side, which means 256 parallel ad campaigns can be measured per website or app.
  • A 4-bit identifier on the conversion side, which means 16 different conversion events can be distinguished.
  • Fraud prevention via unlinkable tokens will be coming.

The WebKit post says Apple first introduced this technology in 2019 under a different name. To become a web standard, another browser needs to add PCM into its system. This is a current goal of Apple.

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