Question How to build my own flashcard from scratch?

Hi guys. My name is VGamer and I'm new here. I'd just like to say, first of all, that when it comes to flashcards I've stuck with the safety of those from the DS era. I've been using my SuperCard DSTWO for quite some time now, and it's an awesome product. But I would love to custom-build a flashcard (possibly a Supercard clone but if that's not possible, something else that can be made to have a similar interface, but allow for extra customization would be fine) so that the flashcard looks, and behaves, exactly the way I want it to (it would also be nice if the card was usable on N3DS). I'd keep the DSTWO handy as a backup, of course Does anyone think they can help me with creating my ultimate flashcard? Thanks in advance for your help, guys!