In my opinion SR apps should not compute the repetition interval by themselves but rather ask the user. After revealing the answer you should be able to say "r

In my opinion SR apps should not compute the repetition interval by themselves but rather ask the user. After revealing the answer you should be able to say "repeat this soon, later, much later". A different kind of app shouldn't use time at all but rather a queue of all words/cards and then put cards back a certain number of positions, depending on level and user input. The queue system works a lot better with different timescales (practicing over short or long terms), and it doesn't tell you how much time you have to put in at any given day. It also takes less parameters, I think.