The app looks nice although I haven't tried it. It's nice that you support lower versions of iOS (I'm using iOS 9).
The cards are kinda tall, seems like it would look kinda ugly on larger devices when there is a low amount of text.
Not sure if it takes from /r/todayilearned though?
Good luck with your app, guys.
One issue: if I flick a card away very slowly, it’s pretty annoying how long it takes to float away.
I’d suggest a minimum velocity...