[jmcannon]

Pasting my response from below:

Two things, I think.

First, I was a long time power user of Anki and don't mean to disparage it, but I think CleverDeck has a much better user experience and design.

Second, we've spent a tremendous amount of time putting together high quality frequency lists (mostly for languages right now) that incorporate professional imagery, native-speaker audio, transliterations (where relevant), and example sentences. Usually, making or piecing together your own decks and cards is the most time-consuming part of using an SRS - and user content is often of dubious quality. In terms of the spaced repetition, though, CleverDeck and Anki actually use the same algorithm.