Some things I could find just now:
Anki vs. SM-8: https://anki.tenderapp.com/discussions/effective-learning/12...
SM-2 vs. SM-17: https://supermemo.guru/wiki/Universal_metric_for_cross-compa...
Anki vs. custom machine learning scheduler: https://old.reddit.com/r/Anki/comments/d0i8uy/improved_algor...
Anki vs SM-17: https://unrelatedwaffle.medium.com/battle-of-the-spaced-repe...
SuperMemo seems to fall behind Anki in the short term (<6 months), but eventually makes up for it. Some of the links reflect that.
As for open-source implementations, there this: https://github.com/slaypni/SM-15
Some things I could find just now:
Anki vs. SM-8: https://anki.tenderapp.com/discussions/effective-learning/12...
SM-2 vs. SM-17: https://supermemo.guru/wiki/Universal_metric_for_cross-compa...
Anki vs. custom machine learning scheduler: https://old.reddit.com/r/Anki/comments/d0i8uy/improved_algor...
Anki vs SM-17: https://unrelatedwaffle.medium.com/battle-of-the-spaced-repe...
SuperMemo seems to fall behind Anki in the short term (<6 months), but eventually makes up for it. Some of the links reflect that.
As for open-source implementations, there this: https://github.com/slaypni/SM-15