Anki is the spaced repetition tool that introduced most of the world to the technique. It's also kept its 2007 UI, has a learning curve that rivals Emacs, and forces you to think about cards before you can think about content. For people who actually want to use spaced repetition rather than become Anki power users, a quiet generation of alternatives has emerged — some genuine improvements, some clever specializations. The list below sorts them by what they're trying to be: drop-in replacements that lower the friction floor, tools that integrate spaced repetition into the act of reading, software that bakes SR into language learning specifically, and the writing behind the algorithm itself. One deliberate omission: Memrise, Duolingo, and the gamified consumer apps in their lineage are not linked — they teach spaced repetition by accident at best, and at worst they sell exposure to content as if exposure were learning.

An opinionated map of spaced repetition tools and methods that don't require buying into Anki's culture.