You can use common accessibility features with Gmail, like screen readers and TalkBack.
You can use VoiceOver screen reader with the Gmail app on iPhones and iPads.
Step 1: Turn on VoiceOver
If you haven't already turned on VoiceOver, visit the Apple help site for instructions.
Step 2: Use VoiceOver
Once VoiceOver is on, you can navigate in Inbox using standard iPhone or iPad VoiceOver gestures.