Interactive tools
Learning tools
Free in-browser tools for adult learners of Spanish, French, and Mandarin. Vocabulary drills, an honest time-to-fluency estimator, a tone trainer, and a spaced-repetition flashcard deck. No accounts, no streaks, no upsell.
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.
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.