Now I use flashcards on iPad
It has a large screen and good for reading
It's a friendly presentation device for complicated and well formatted content
Could you support cards which is written in HTML
It will have great style support, even video, javascript, vector graph and latex.
I just worry about swipe/tap control will conflict with the HTML card
But for me, it's ok if the HTML card not support click and scroll.
And last, you creat the best flashcards app on touch device and totally defined what a flashcards app should be!!
Regards,
Gucci