Android Privacy Sandbox and the GAID

The GAID is Android's resettable advertising identifier, and Privacy Sandbox on Android was Google's initiative to bring iOS-style privacy limits to Android, an effort Google has since largely wound down.

You measure Android installs today mostly with the GAID, also called the AAID, a device-level advertising ID you can still pass to networks for deterministic, user-level attribution the way iOS worked before App Tracking Transparency. For years the looming story was Privacy Sandbox on Android, Google's plan to replace that ID with privacy-preserving APIs and slowly close the open Android world.

That timeline has shifted hard. In late 2025 Google wound down most of the Privacy Sandbox effort on Android, stepping back from shipping those APIs as the GAID's replacement, and Google's guidance says the advertising ID will be kept with substantial notice before any future change. So for now the GAID keeps working and Android measurement stays far more open than iOS.

Do not read that reprieve as permanent. The GAID still returns zeros whenever a user opts out or an app fails to declare the advertising-ID permission, opt-outs keep rising, and Google framed this as a pause, not an exemption. The deterministic Android world is still slowly shrinking through user choice and Play Store policy, just without the hard cliff iOS had, so build your Android measurement to degrade gracefully toward aggregation and first-party data rather than assuming the open signal lasts forever.

Android stayed open longer than anyone expected, but planning as if it always will is the mistake.