I can see lately almost all 3rd party gmail apps/clients require access to "View and manage your mail". I know that they need this to delete emails, starring, labelling etc.
My question is, are the app developers (not the app) able to access and read my emails without my knowledge (I'm assuming google will send a new email when it recognizes a new login attempt from unrecognized device)? Is it possible for them to do that as they don't have access to my password?