I can't tell (neither from the website, nor from using it) how this is different from any other flashcard software? You mention you focused on "speed of review

I can't tell (neither from the website, nor from using it) how this is different from any other flashcard software? You mention you focused on "speed of review". How did you do that? There are apparently no hotkeys? (My speed of review is therefore lower than Anki, due to needing to use the mouse.)