How Spaced Repetition Works

Newly learned material fades fast; a review made just before forgetting strengthens memory most durably. Spaced repetition builds on this principle.

Every card in Qurandia Academy has a schedule:

• Again: you couldn't recall — the card returns shortly.
• Hard: recalled with difficulty — the interval grows slightly.
• Good: recalled comfortably — the interval is multiplied by the card's ease factor.
• Easy: trivial — the interval grows further.

Each success widens the gap: 1 day → 3 days → a week → three weeks… Cards you know well appear rarely; the ones you struggle with come back often.

Consistency beats duration: ten minutes daily outperforms one long weekly session. The streak indicator tracks exactly that consistency.