Today I played with the app, Tellagami. I just have the free version ... can make 30 second videos with limited avatars.
I'm leading a short session on Desmos in a couple of weeks ... so I experimented with Tellagami to explain why I like Desmos. Check it out here. It's just my first run at it. I want to try again soon.
I envision using the app in class ... 30 second videos on vocabulary, maybe explaining just one problem, or thoughts about a concept.
30 seconds is very short!