Is the firebase cloud messaging registration token per app or per device?

Question

If I distribute two apps x and y (under the same developer account), will a user who has both apps installed have the same token for both apps?

Answer 1

A registration token is associated with an app instance -- an app's installation (also mentioned it here). Since it's two different apps, it should generate different tokens.

With that said, I would suggest making different projects per app in your developer account.