Hello! I´d like to know more about the monthly users. If i use my app with the same email login, but two different devices: it counts as one user or two users? Thanks!

I created the app with my email, but the person who is going to use it, has another email. I´ve already add him as an user. When i make any changes to the app, it´s with my email. Does it count as two unique users, or the creator doesn´t count? Thank...