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Spaced repetition learning
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Cultivar helps you memorise vocabulary using spaced repetition: words you know come back less often, words you struggle with come back sooner.
Each time you get a word right it moves up a box and comes back later: New, Seen it, Know a bit, Getting there, Comfortable, Strong, Mastered (intervals stretch from 1 day out to a year). Get it wrong and it drops back to the start.
You get a fixed number of new words a day. Once you've started them all, you can add more, which keeps things from piling up.
After you flip a card, you decide whether you knew it. This is on purpose. Trying to recall the answer before checking is what builds memory (the "testing effect"), and judging whether you really knew it is a form of metacognition that strengthens learning in its own right. Honest self-rating is how all serious spaced-repetition systems work. Being kind to yourself when you were close just means you will see that word more often, which is no bad thing.
See every word in a deck and which box it's in. Nudge words between boxes, mark ones to ask soon, skip, or never. Change your daily limits here too.
Before an exam, drill all words from any decks you pick, both directions, in random order. Rate each Know it, Partially or Don't know. This is separate from your normal schedule and never disturbs it.
Permanently deletes your learning history for one deck. Your enrolment and the deck's words stay; only your progress is wiped.