FlexiStak goes beyond the basics when it comes to flash cards. You can create your own Staks and quiz yourself. If you're learning a language, you can reverse the question and the answer on the flash card (for example, English to Spanish and Spanish to English). You can have FlexiStak automatically flip the card for you and move onto the next one at an interval you specify. Use the great import and export features to give a Stak to a friend or ..