As announced at Google I/O, app tracking is now a first-class citizen in Google Analytics. The old SDKs used web tracking concepts, but now anybody can use the

As announced at Google I/O, app tracking is now a first-class citizen in Google Analytics. The old SDKs used web tracking concepts, but now anybody can use the new SDKs and the new reports, which are designed just for mobile apps. To answer your questions, the new App Analytics SDKs (Android and iOS) support multiple reporting IDs. The new custom variables are essentially named dimensions and metrics that can persist for the duration of a session, and are much simpler to work with than the custom variables in the old SDKs.