AnkiWeb.net is a system for spaced repetition, which displays flash cards based on how often they’re successfully remembered. The stand-alone desktop program, called Anki, was the starting point: a simple free flashcard program. Nowadays it runs on smartphones and most computer platforms, or on the Internet via AnkiWeb.net.

The underlying technique, spaced repetition, can do wonders for people wanting to learn a set of facts or a new language. In fact, Anki got recommended as the ideal tool to learn the vocabulary of a new language in a LifeHacker featured article.

The Fool’s Workshop also reviewed Anki: they mention that Anki’s strongest areas are in the statistics it provides, its tagging abilities, its strong interval study centered approach and its “card model”.

Despite running mostly on mobile phones or desktop computers, AnkiWeb managed to attract a significant online presence, averaging over 3’000 unique monthly visitors in the last 12 months.