Smart Revision

Smart Revision uses the SM-2 spaced-repetition algorithm to schedule reviews right before you'd forget — locking solutions into long-term memory.

1. Add a problem to your revision deck.
2. Visit Smart Revision to see cards that are due.
3. After reviewing, rate how well you recalled it (0–5). The interval to the next review adjusts automatically.

Smart Revision is part of the Go and Plus plans.