RFC: Research existing spaced repetition libraries

[osdiab]

Before putting a lot of work into a specific implementation, research existing options out there for different platforms; make a doc about it that will serve as a basis of comparison between this future library and the existing ones, and also as a starting point for deciding how this library can be better than the rest

a place to start: goblin89's post on HN in Apr 2020:
https://news.ycombinator.com/item?id=22931629

There seems to be an unaddressed need for a well-maintained library implementing spaced repetition algorithms. I have seen implementations for SM15[0] and SM2[1][2] around but nothing that provides multiple implementations and a consistent API on top.If there was a library like that, a tool like SpacedTime could use it easily (currently it uses fibonacci sequences when determining how soon to recall).

[0] https://github.com/slaypni/SM-15, https://news.ycombinator.com/item?id=9844613
[1] https://github.com/walterscarborough/LibSpacey
[2] https://gist.github.com/doctorpangloss/13ab29abd087dc1927475e560f876797