Interactive tools
Learning tools
Free in-browser tools for adult language learners. Vocabulary drills, an honest time-to-fluency estimator, a Mandarin tone trainer, an Esperanto word builder, and a spaced-repetition flashcard deck. No account needed, no upsell.
Drill
Word drill
A quick drill that tests each word four ways (recognise it, recall it, type it, build it from tiles) and brings back the ones you miss. Works with every course on the site.
Drill
Flashcards (spaced repetition)
Spaced-repetition flashcards in your browser: three starter decks, plus a deck of the words from any story you read. Your progress stays on your device.
Drill
Vocabulary quiz
A multiple-choice quiz on random words from the Spanish, French and Mandarin Core 100 decks.
Drill
Mandarin tone trainer
Practise the four Mandarin tones on one syllable, so the tone is the only thing that changes. It drills the pairs adult learners most often mix up.
Word builder
Esperanto Affix Sandbox
Stack mal-, -ej-, -il- and friends onto real roots and see what you have built: an attested dictionary word, or a grammatically perfect hypothetical the community can vote on.
Estimator
FSI time-to-fluency estimator
Enter your weekly hours and target CEFR level for an estimate of how long it will take, based on the FSI's language categories.