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Glossary

Anki

Anki is a free, widely used spaced-repetition flashcard program with a large ecosystem of shared decks and add-ons.

It is the de facto standard for serious vocabulary work, and its scheduling algorithm — a descendant of SM-2 — is what most other spaced-repetition systems are compared against.

Its cost is setup. Card templates, note types, deck options and add-ons are all configurable, which makes it powerful and makes the first hour discouraging. Many people who would benefit from spaced repetition bounce off Anki rather than off the technique.

In NoaLingua NoaLingua has its own built-in review so you do not need Anki, and exports to it so you are not trapped if you prefer it. The export can include images captured from the video and the speaker's real audio, and it is free on every plan.