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
Learn vocabulary the way it sticks: a fast, mixed drill that quizzes each word four ways - recognise, recall, type and build - and brings back the ones you miss. Spanish, French and Mandarin.
Drill
Flashcards (spaced repetition)
Drill vocabulary with a spaced-repetition engine in your browser. Decks for Spanish, French, and Mandarin. Progress stored locally.
Drill
Vocabulary quiz
Multiple-choice vocabulary quiz across the three launch languages. Random words from the Core 2,000 frequency list.
Drill
Mandarin tone trainer
Drill the four Mandarin tones using the same syllable so the only variable is the contour. The pairs adults reliably confuse, paired off.
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
Input your weekly hours and target CEFR level. Get an honest estimate of how long it will take, based on FSI category data.