Definition
The canonical answer.
The ATT opt-in rate is the share of iOS users who allow tracking through Apple’s App Tracking Transparency prompt. It sets how much user-level attribution signal an app has: opted-in users can be measured deterministically, while the rest are measured through aggregate frameworks
Worked example
In practice.
An app shows a pre-prompt explaining the value exchange before the system dialog, timed after a first success moment rather than at cold start. Opt-in improves, which enriches every downstream system at once: better match rates, better optimization signal, and less reliance on
Where this work happens: Mobile
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