Try making it possible to flip and swipe in single motion.
At first show “got it right” / “got it wrong” buttons. When first card gets swiped, don't show them and rely on touch; but only for the duration of a learning session. When swiping left/right somehow show which way is ”right” and which is “wrong” (colours?)
Buttons act as a reminder of which way is what and also user may have attached a keyboard/mouse to the device.
Swype for reveal/answer.
Try making it possible to flip and swipe in single motion.
At first show “got it right” / “got it wrong” buttons. When first card gets swiped, don't show them and rely on touch; but only for the duration of a learning session. When swiping left/right somehow show which way is ”right” and which is “wrong” (colours?)Buttons act as a reminder of which way is what and also user may have attached a keyboard/mouse to the device.
Related: how to communicate keyboard usage?