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Become a sponsor to Open Spaced Repetition

Open Spaced Repetition (OSR) is an open-source community dedicated to the advancement of spaced repetition algorithms. We are the creators of the Free Spaced Repetition Scheduler (FSRS), which is backed by academic literatures and experiments. FSRS has been implemented in various programming languages, including Javascript, Golang, Rust, Python, and so on.

Featured sponsors

@tiger-pillow

Current sponsors 1

@tiger-pillow

Meet the team

Featured work

  1. open-spaced-repetition/awesome-fsrs

    A curated list of awesome FSRS implementations, papers and resources

  2. open-spaced-repetition/fsrs4anki

    A modern Anki custom scheduling based on Free Spaced Repetition Scheduler algorithm

    Jupyter Notebook 2,855
  3. open-spaced-repetition/ts-fsrs

    ts-fsrs is a versatile package based on TypeScript that supports ES modules, CommonJS, and UMD.

    TypeScript 236
  4. open-spaced-repetition/fsrs-rs

    FSRS for Rust, including Optimizer and Scheduler

    Rust 192
  5. open-spaced-repetition/srs-benchmark

    A benchmark for spaced repetition schedulers/algorithms

    Jupyter Notebook 67

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