checklist.day

FSRS (Free Spaced Repetition Scheduler)

JSON →
library 6.3.1 ·python
✓ verified Jun 7, 2026
ai-ml

Python implementation of the Free Spaced Repetition Scheduler (FSRS) algorithm, currently at version 6.3.1. It provides memory state management and card scheduling for spaced repetition systems. Released on a monthly cadence.

Resources

githubgithub.com/open-spaced-repetition/py-fsrs ↗
homepagegithub.com/open-spaced-repetition/py-fsrs ↗

API endpoints

full doc /v1/registry/fsrs
install /v1/registry/fsrs/install