Supermemo supposed to have a better spaced repetition algorithm from what I've read. Supermemo also supports incremental reading; a very intriguing concept. Of

Supermemo supposed to have a better spaced repetition algorithm from what I've read. Supermemo also supports incremental reading; a very intriguing concept. Of course all of this comes together bundled in a windows app with no mobile support. Anki ecosystem is much easier to use.