open-spaced-repetition/fsrs4anki

Health v2 · maintenance only

Adoption not part of the score

4074 stars · 162 forks observed · 2026-09-24

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

FSRS4Anki is a modern spaced-repetition scheduler for Anki based on the Free Spaced Repetition Scheduler (FSRS) algorithm. It replaces Anki's built-in scheduler and uses machine learning to optimize scheduling parameters from a user's review history.

Use cases

• improve anki card scheduling accuracy
• personalize spaced repetition intervals with machine learning
• replace SM-2 scheduler with a better algorithm
• optimize review schedule from my anki review history
• remember more with fewer reviews in anki

When to choose

• you use Anki and want more efficient, personalized review scheduling
• you want a data-driven scheduler that learns your memory patterns
• you are on Anki 23.10+ where FSRS is built in, or want the standalone add-on for older versions

When to avoid

• you don't use Anki or another flashcard workflow
• you prefer Anki's default SM-2 scheduler and don't want to tune parameters
• you need a scheduler for a non-Anki spaced repetition app

Facets

plugin · maturity active

machine-learning deep-learning education machine-learning cross-platform anki-addon spaced-repetition srs fsrs scheduler memory-optimization optimization memory desktop

Member repositories

For agents

markdown · JSON · MCP: product_card(name="open-spaced-repetition/fsrs4anki")