Hi Amber! I've never used Italki classroom. I always use Skype to my classes here on Italki. There is no charge once you are not calling a phone. All you have to do is to create a Skype account, then you will add your teacher/tutor as a contact and start the class. There are several features on Skype that I enjoy, one of them is the possibility to record your class to review it later. Hope this helps!