I've finished all the WK kanji in Ringotan and I've found that hitting Ringotan on "frequent review" accelerates my learning so much that I really want to do it with every new non-Jinmeiyou kanji I find in the wild. My first question is, is one of the filter options when selecting what list you want to study kanji from comprehensive, i.e. includes everything that's inside of Ringotan? Because I keep finding myself having to jump from list to list to find different kanji I come across. (a) Is one comprehensive; (b) if not could we get that :); (c) if

I saw your blog post describing the algorithm used in this app and I wonder about this difficulty factor. In Anki there seemed to be the whole issue around "ease factor", so much that one of the most used addons modified this. It's an outdated issue with the new FSRS there though.

So what I'd like to ask is, how does your current algorithm behave when you fail a review many times, then start being succesful again? Do the initial failures mean you're forever cursed with short review interval for that specific review, or will it fix itself? I see