Study Blue...Flashcards!

I've been looking for a way to get kids digital flashcards so they can review their science and reading vocabulary.  In my search, I came cross StudyBlue.  This site says you can create flashcards, share those cards and access them on a variety of mobile devices.  So far, I've not been able to get it to do anything but allow me to create some cards.  I'll keep taking a crack at it, but I'd love to hear of other options you all have come across.  Leave me a comment. Thanks and God's Peace.