FSRS 5: Continuity of Card Difficulty Distribution

Yes. The scheduling is still static. It is not “real-time”. If the next interval was 2h on 10:00 AM and I do not press good, then come back later in the day 5 PM and then review it, the button will still say 2h.

  • If there is a way to make FSRS “real-time”,
  • that and the making an asymptote at minimum difficulty could perhaps lead to smoother difficulty curves.

But I don’t believe that’s all there is to it.


  • I think this also has something to do with FSRS not being to factor in Short-term memory and how it behaves “real-time”