As far I understand FSRS is one of the best spatial repetition algorithms out there. Its claimed to be academically backed and it is open-source. ANKI is moving away from its own custom implementation. I would love if Hanzi-hero could use this or at least make it optional. Not sure if its worth trying to reinvent the wheel here, at least from the docs it reads like your making your own implementation.
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Welcome!
This is something we looked into when we fixed up our SRS to be in-line with other SM-1 based SRS systems that most applications use. FSRS is still quite new, so we wanted to wait until it sees further adoption before making the jump ourselves. For example, it is not yet the defualt scheduler in Anki, as the lead developer himself notes that they want more time to make sure all kinks are ironed out.
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I too would love this feature, it’s unfortunately keeping me from this otherwise awesome website 