Gmail App, Gmail Webmail and Inbox Metrics
I work with an ESP that can not track or differentiate opens between the flavors of Google email products. They can only provide the number of pushed and delivered to @gmail.com addresses in the list. I need more explicit analytics.
Is there a development tactic or third-party method that can target specific Gmail instances of: Gmail App on iOS, Gmail App on Android, Inbox App on iOS, Inbox App on Android, Gmail webmail client in a browser, etc? For example, loading a tracking pixel via a specific Google applied CSS class.