Interactive tools built on the same FSRS engine and CEFR word data that power Words on Repeat. All free, no signup, no tracking beyond consent-gated analytics.
How many words do you actually know? Tap through a CEFR-graded sample and get your estimated vocabulary size and level — in 8 languages.
Take the test → PlannerPick a target level and daily pace — get the date you'll arrive, plus the FSRS review-workload curve that makes or breaks study plans.
Plan your route → Interactive demoWatch FSRS and SM-2 schedule reviews on the same memory — and see why timing decides whether vocabulary sticks or slips away.
Explore the curve →Test your vocabulary to find where you stand today, plan your route to the level you want, and study with free CEFR-leveled decks scheduled by the FSRS algorithm you can explore in the simulator. Everything here is free — the tools, the decks, and the spaced repetition itself.
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