In the new api, you can simply do as follows: Initialize Simperium (which, in turn, wires your Core Data stack): self.simperium = [[Simperium alloc] initWithModel:self.managedObjectModel context:self.managedObjectContext coordinator:self.persistentStoreCoordinator]; Once you're ready to enable sync'ing (and thus, authenticate the user): [_simperium authenticateWithAppID:@"{SIMPERIUM_APP_ID}" APIKey:@"{SIMPERIUM_APP_KEY}" rootViewController:_window.rootViewController]; (No need to flip the authenticationEnabled flag anymore!)...
We do have a Simperium library for Android that is still under development but it should be able to suit your needs in its current state. The best example out there is to check out how we used Simperium in WordPress for Android. I'm not sure how familiar you are...
I'm sorry to say that, at least for the time being, there is no API to list usernames / id's per Simperium App. Please, bear in mind that even if you setup a Shared Bucket, it would not be a good idea to let every client put data there (because,...