FSRS is the most important thing to happen to flashcards since SuperMemo wrote SM-2 in 1987. It models your real memory instead of guessing at it, which means fewer reviews, less cramming, and far better long-term retention - especially for Mandarin, where the review load from sheer character count crushes most learners within months. This hub explains how FSRS works, why it beats SM-2 in head-to-head retention tests, and how to use it without configuring a thing.
Spaced repetition hub
FSRS Spaced Repetition: The Algorithm Behind Modern Flashcards
FSRS explained: how the Free Spaced Repetition Scheduler works, how it differs from SM-2, why Mandarin learners should switch, and which apps ship FSRS built in.
Articles in this collection (2)
Learning Tips
FSRS vs SM-2: Which Spaced Repetition Algorithm Is Better for Mandarin?
FSRS vs SM-2 compared head to head. Retention numbers, review load, the limitations of SM-2, and why Mandarin learners should switch to FSRS in 2026.
9 min read · 2026-08-31
Learning Tips
What is FSRS? The Free Spaced Repetition Scheduler Explained
FSRS is a free, open-source spaced repetition algorithm that schedules flashcards around your real memory. How it works, how it differs from SM-2, and how to switch.
10 min read · 2026-08-31
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