Spaced repetition systems have gotten better

I've been looking into FSRS since I'm building a language learning app[1], but I haven't implemented it yet. Can FSRS work if I don't want to have 4 choices - bad, good, hard...? I have found myself to get into a decision paralysis so just bad/good works better for me. Plus I can swipe the cards tinder style! :D

My second reason is that I'm worried about the complexity - both from non-nerdy users perspective and me having to debug it.

[1] https://vocabuo.com

Yes. Some months ago, I forget whether it was v5 or maybe before, the 2 button grading approach meant that it actually performed better for users (ie. it performed better for users that explicitly only used two grading buttons).

I don't know if this is replicable with v6, or not. I would be interested to find out!

According to the FSRS author [1], it will adapt to two buttons.

[1] https://www.reddit.com/r/Anki/comments/16t2lva/comment/k2cor...