The forgetting curve behind the algorithm
Anki's scheduling is built on research going back to 19th-century psychologist Hermann Ebbinghaus, who documented how quickly newly learned information fades from memory over time β the "forgetting curve." Reviewing information right before it would otherwise be forgotten resets that curve far more efficiently than cramming through repetition alone, which is the core idea spaced-repetition software is designed around.
You rarely have to start from a blank deck
Anki has an active community of users who share pre-made decks for everything from language vocabulary to medical terminology and exam prep, downloadable directly from shared-deck sites. Starting from a well-made shared deck and customizing it can save significant setup time compared to building every card from scratch.
Frequently Asked Questions
Is Anki free to use?
The desktop and Android versions are free, while the iPhone app is sold as a paid download.
Can I use decks that other people have made?
Yes β shared-deck sites let you download decks that other users have built and start using them right away.