Master anything with smart spaced repetition
Mimir schedules your reviews at the exact moment you're about to forget — backed by the SM-2 algorithm and a mastery engine that tracks real progress.
Term
Ephemeral
Lasting for a very short time.
How well did you know it?
How it works
Three steps to steady, lasting learning — no gimmicks, no streak guilt.
Create or discover a set
Build your own study sets in seconds, or browse public sets shared by the community.
Study with spaced repetition
Mimir schedules each card so you review it right before you would have forgotten it.
Track mastery & forecast
See what you have mastered, what needs work, and how many cards are due each day.
Everything you need to learn
A focused set of features built around one goal: helping you remember what you study.
Multiple study modes
Flashcards, Learn, Test and Match — pick the mode that fits how you learn today.
Rich content sets
Create sets with images, language pairs and bulk import. Public, unlisted or private.
Collaborate & share
Invite editors and viewers, and leave threaded comments on any set.
Folders, tags & favorites
Organize your library the way you think — with folders, tags and starred cards.
Forecast & analytics
See per-set mastery, average ease factor and a 30-day forecast of what is coming due.
Mastery engine
A New → Learning → Mastered state machine layered on top of SRS, so you can trust the signal.
Progress you can trust
A mastery engine that separates knowing from guessing
Each study mode contributes to mastery at a different weight. Recall-heavy modes like Write count more than recognition, so your mastery score reflects real learning — not muscle memory.
Cognitive Science 101
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Plan your week
See what's due — today, tomorrow and 30 days out
The forecast tells you exactly how many cards are coming due each day, so you can pace your studying instead of drowning in a backlog.
Next 14 days
253 duePeak day: 30 cards — plan a longer session or spread across two days.
Learn together
Study sets built for collaboration
Invite classmates as editors or viewers. Leave threaded comments on any set. Keep public sets discoverable and private sets locked down.
Collaborators
Frequently asked questions
Short answers to the things people ask most.
Spaced repetition is a review schedule that spaces cards further apart the better you know them, and pulls them back in when you start to forget. Mimir uses SM-2, a peer-reviewed algorithm with a 30+ year track record.
Start remembering what you study
Join Mimir and let spaced repetition do the heavy lifting. It only takes a minute to create your first set.