Yokatta© is an open-source flashcards based language learning app using spaced repetition. The algorithm is heavily influenced by SuperMemo's SM-2 and follows best practices using Android Architecture Components provided by Google.


App features:

selectable themes
randomize order of flashcard during review
review animation for visual feedback
"sligtly-off" toast when answer submitted is not quiet correct
haptic feedback when submitting an empty answer
recording pronunciation
double press "back