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In match mode, the screen will be split into two scrollable sections, and the user will have the option to check if the front and back of the card match up. If they do, then the card is removed from the game.
Learnability
If our user has installed the application for the first time on his phone, then it will be very quick to pick up. There are only 3 large action buttons on the main screen, each of which whose function is fairly obvious. When creating a new set, there are very limited actions for use with each flashcard.
There is an inconsistency with browsing an editing flashcards. While making flashcards, users hit the "Reverse" button to switch from front to back. When reading flashcards, one simply taps the flashcard. Hopefully, the user would think to tap the flashcard because there isn't much else to do other than swipe up or down as opposed to left or right. Because swipe is slightly more inconvenient than tap, the latter is preferred.
Efficiency
It may take a while for a user to add a new card to an existing set by having to scroll down all the way to the end to add a new card. However, having the new flashcard template be the very last card in the deck makes for good use of screen space when making a new set altogether, because having large square buttons is optimal for smartphone usage. In addition, finding certain cards in a set may be difficult to do quickly.
Safety
Because certain action buttons on the home screen are greyed out, it is impossible to do certain undesirable actions such as edit multiple sets at once. Lack of undo's means that the user could still potentially delete a flashcard in edit mode and not get it back very easily. The eye toggle is great for safety, because if a user checks a card and has chosen to auto-hide all checked cards, then he can set the visibility back and uncheck it. The eye toggle also serves the dual purpose of when users might not actually want to auto-hide checked cards.