Spaced Repetition
Flashcards
100 OPRA cards · SM-2 spaced repetition · swipe to rate
All caught up!
No cards due right now — your memory is in good shape.
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How it works
Spaced repetition
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See the question
Each card shows an OPRA-style question. Think of your answer before flipping.
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Flip & rate
Reveal the answer, then rate yourself: Again, Hard, Good, or Easy.
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Cards come back
The SM-2 algorithm schedules each card at the optimal time to build long-term memory.