What's your design process? Any sketches, wireframes, other people testing? Also do you have a video demo or screencast?

My design process is heavy on prototyping directly in code. I usually start off with sketches in pen and paper and then a quick mockup of the UI directly using Swift code since my apps are for iOS and Mac only.

I don't have any testers on this new version at the moment, but I'm considering having some beta testing once I get closer to release. No videos either, but I'm planning on writing some blog posts going over some of the UI flows and new features in the app to help with promotion. Once I polish the lesson UI a little bit, I'll probably post a video on YouTube of it too.