Take a look at FSRS. The paper: https://dl.acm.org/doi/10.1145/3534678.3539081?cid=99660547150 https://dl.acm.org/doi/10.1145/3534678.3539081?cid=996605471...

Take a look at FSRS. The paper: https://dl.acm.org/doi/10.1145/3534678.3539081?cid=99660547150 https://dl.acm.org/doi/10.1145/3534678.3539081?cid=996605471... Various implementations: https://github.com/open-spaced-repetition/awesome-fsrs https://github.com/open-spaced-repetition/awesome-fsrs Some benchmarks of various srs algorithms: https://expertium.github.io/Benchmark.html https://expertium.github.io/Benchmark.html