Why doesn’t Anki use SuperMemo’s latest algorithm? The simple answer is that SuperMemo’s latest algorithm is proprietary, and requires licensing. As Anki is an open source application, it can only make use of algorithms that have been made freely available. We’re inclined to believe SuperMemo when they say their newer algorithms are more efficient, but feel that to a certain extent, it is a case of diminishing returns. The gains achieved by moving from a traditional study routine to SM-2 are already great, and by sticking with an open algorithm, your learning data is not locked into a single product. Ultimately it’s up to you to decide - if access to the latest and greatest scheduler is a higher priority than the things that Anki brings to the table, you may want to check out SuperMemo to see if it is a good fit for you.