What Spaced Repetition Algorithm is Used?

We use a variant of SM-2 for calculating flashcard intervals.

Here are some significant alterations we have made:

  1. Applying randomness to intervals to prevent too much clustering on the same day,
  2. Using only 3 grades instead of 6 (OK, Good and Bad) for user-friendliness,
  3. Prioritising flashcards based on user input; in case there's not enough time to complete all repetitions, the most important ones can still be done
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