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—Retention (Pro)
30-day review history Pro
Study 6 ready-made decks or build your own. FSRS scheduling shows you exactly when each card comes back.
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30-day review history Pro
Free is genuinely useful on its own: all 6 starter decks, up to 3 of your own decks (200 cards each), the full FSRS study queue with predicted intervals, and JSON export/import. Pro removes the limits and adds the power tools:
{{c1::text}}.Get Pro — US$9 one-time →
Want to try first? Use demo code AV-RECALL-CARDS-DEMO to preview every Pro feature on this device.
Cramming feels productive because you can recall everything right after you study it — then most of it is gone within days. Spaced repetition works differently: instead of reviewing everything on a fixed schedule, it shows you each card again right before you're about to forget it. That moment of slight effort — "I almost forgot this, but I got it" — is exactly what strengthens long-term memory. Review too early and you waste time on something you already know; review too late and you've already forgotten it and have to relearn it from scratch. The trick is finding the right moment, individually, for every single card.
Doing that by hand for a deck of 60 cards, let alone 600, is impossible — which is why spaced-repetition software exists. Recall keeps a tiny memory model for every card you study: how strong it currently is, how hard it has been for you personally, and exactly which day it's predicted to slip below a target recall probability. Grade a card, and the next review date is recalculated instantly.
Recall uses FSRS-4.5 (Free Spaced Repetition Scheduler), the algorithm that newer versions of Anki adopted after decades of the older SM-2 formula. FSRS tracks two numbers per card instead of one: stability (roughly, how many days it takes for your recall probability to fall to about 90%) and difficulty (how hard this specific card has been for you historically, independent of how long you've known it). Every time you grade a card, both numbers update from the actual time that passed and the grade you gave — not from a fixed multiplier table.
The target is your desired retention — 90% by default, meaning the schedule aims to have you recall roughly 9 out of 10 due cards correctly. Lower it and cards come back less often but you'll forget more of them; raise it and you review more often but forget almost nothing. Pro lets you tune this between 80% and 95%; free study always targets 90%, a well-tested default for most learners.
Again means you didn't recall it — the card is treated as a lapse, its stability drops sharply, and it comes back inside the current session after about 10 minutes as well as being rescheduled short-term for tomorrow-ish. Hard means you got it, but it was a real struggle — the interval grows only a little. Good is the default correct answer: no hesitation, normal effort — this is the button you should press most often. Easy means it was instant and effortless; FSRS applies an extra "easy bonus" on top of normal growth, which is why the jump in the button label can look large. Every button shows its predicted interval before you press it, so there's never a guess about what a grade will do.
All six install automatically the first time you open Recall. Delete one and you can always re-add it from the deck grid — nothing is ever lost from the built-in set.
Free covers real studying end to end: all 6 starter decks, up to 3 decks of your own (200 cards each), the full FSRS queue with due/new interleaving and daily caps, 4-grade review with live interval previews, keyboard shortcuts, per-deck stats, and JSON export/import so your data is never trapped. Pro (a one-time US$9, not a subscription) removes the deck and card ceilings and adds paste-import, reverse cards, cloze deletion, an adjustable retention target, a 30-day per-deck history chart with retention %, and study-ahead. Try every Pro feature first with the demo unlock code before you buy.
Educational tool only — Recall does not diagnose learning disabilities or provide instructional advice; it is a scheduling aid for material you choose to study.
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