Google Analytics for Firebase collects certain information in its default implementation.
Google Analytics for Firebase data collection
The type of information collected through the Google Analytics for Firebase default implementation includes:
- Number of users and sessions
- Session duration
- Operating systems
- Device models
- Geography
- First launches
- App opens
- App updates
- In-app purchases
See a full list of the default events and user properties collected by Google Analytics for Firebase.
Identifying devices
The Google Analytics for Firebase SDK library uses an app-instance identifier to identify a unique installation of the App.
When using the SDK, an app-instance identifier gets generated at the app level.
By default, the Firebase SDK collects identifiers for mobile devices (for example, Android Advertising ID and Advertising Identifier for iOS) and utilizes technologies similar to cookies.
On iOS, the SDK collects the Advertising Identifier if it is available. For IDFA to be available, a developer has to link in the AdSupport.framework library.
If the Advertising Identifier is unavailable, the SDK collects the Vendor Identifier. If the Advertising Identifier becomes available after the Vendor Identifier was reported, the SDK stops collecting the Vendor Identifier.
By default, on Android the SDK collects the Advertising ID.