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This is one flavor of these types of algorithms that you can viably implement yourself: https://en.wikipedia.org/wiki/Leitner_system https://en.wikipedia.org/wi

• asdfman123 8y ago
  That's funny. I developed a crude version of that algorithm by separating my flash cards into easy, medium, and hard stacks. I spent most time on the hard stack and would downgrade the difficulty of cards after I increasingly mastered them. Nothing groundbreaking. I'm sure other people have done the same things out of sheer efficiency - no need to keep going over the easy cards.