I'm pretty sure Google uses shared keychain access. Since iPhone OS 3.0 it has been possible to share data between a family of applications. This can provide a

I'm pretty sure Google uses shared keychain access. Since iPhone OS 3.0 it has been possible to share data between a family of applications. This can provide a better user experience if you follow the common path of free/premium applications or if you have a set of related applications that need to share some common account settings. https://developer.apple.com/documentation/security/keychain_services/keychain_items/sharing_access_to_keychain_items_among_a_collection_of_apps https://developer.apple.com/documentation/security/keychain_...