Spaced Review — Flashcards That Schedule Themselves
All 120 TOEFL words from every set, reviewed on a Leitner schedule stored privately in your browser: know a word and it returns in 2, then 4, then 7 days; miss it and it comes back tomorrow.
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How the system works
- Every word starts unboxed. 'I knew it' promotes it a box; each box waits longer (1 → 2 → 4 → 7 days).
- 'Still learning' sends it back to box 1 and tomorrow's queue.
- Reviews are due by DATE — doing 10 minutes daily beats one weekly hour, because the schedule is the method.
- Your data never leaves this browser. Clearing browser data resets the boxes (the words stay in their sets).