Once you have started to connect with your client(s) they will be able to access all the features that Ate offers as long as they are connected with you (Coach - Client connection). During this Coach-Client connection period, clients can access Ate for Free as you (the Coach) is paying for the Coach Subscription.
You can view all the features of the Ate app here.
Don't forget! As a coach, if you download Ate from Apple or Google and open the Ate app on your phone, log in with the same credentials that you used to sign up with for Ate Coach and you will be able to access all of the Ate app as well to journal for yourself, or simply to check it out.