Official flashcard stacks
Free vocabulary decks for every language pair, ready to study.
OpenFrequency word lists
The 5,000 most common words in nine languages, with IPA, part of speech and example sentences.
OpenFSRS review simulator
See how many reviews a day your routine will cost at any retention target, a year ahead.
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Reusing these resources
Everything here is free for classrooms, blogs and study groups. The word lists are built from open data (OpenSubtitles, the Leipzig corpora, Wiktionary and Tatoeba) and are released under the same open licences as their sources. Each page states exactly which, and a link back to the page is all we ask.