In consulting for a non-profit that provides training and is moving their courses online (starting with one), I need to be able clearly explain the difference in functionality between the free teacher version and a paid subscription. The Canvas support I have found alludes to the fact that the free version is for one teacher (no other users may be added except students) but that with a paid subscription, more functionality and roles are available. 

the details of what is provide by each version is what I am looking for.

thank you