Free · Spaced repetition

Formula Flashcards

Flip a card, say the answer, then be honest. Cards you know come back days later; cards you miss come back sooner — so your study time goes where it matters.

Front of card shows

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Due now
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New
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Learning
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Mastered

Progress is saved in this browser. Review intervals: 1, 3, 7, 14 and 30 days. A card counts as mastered from box 4.