Why?

For most users, FSRS is recommended over the default SM-2 algorithm as it simplifies and reduces the amount of configurable parameters, and can adapt very well to a user's review history. Anki SRS Kai aims to fill a niche for power users who wish to stick with Anki SM-2, but also benefit from the adaptive scheduling algorithm from FSRS.

Some examples for using Anki SRS Kai include:

1. Convert optimized FSRS parameters to SM-2 parameters for more efficient scheduling than the default SM-2 algorithm and use Ease Reward to deal with Ease Hell.
2. Implement your own scheduling algorithm based on Anki SM-2.
3. Replace the Straight Reward addon with Ease Reward which allows users to review on mobile without ever needing to sync on PC.
4. Disable fuzz in the Anki SM-2 algorithm.