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Clozemaster

Clozemaster is a language-learning platform built around the cloze fill-in-the-blank exercise format, where learners complete real sentences rather than isolated vocabulary flashcards. It covers more than 50 languages with over 170 language pairings, and uses spaced repetition to reinforce words learners have already seen. Learners can choose multiple-choice or typing modes, track progress by word frequency to prioritize the most useful vocabulary first, and the platform recently added grammatical sentence analysis. The core game is free to play, with an optional Pro subscription that unlocks advanced features for more serious learners, available on web, iOS, and Android.

Drops

Drops teaches vocabulary in over 40 languages through short, icon-driven games rather than grammar drills, pairing each word with an illustration to build recall through visual association and spaced repetition. The free tier caps sessions at 5 minutes a day, a deliberate constraint meant to build a daily micro-habit instead of encouraging long study blocks.

Duolingo

Duolingo is a popular language-learning platform designed to make education accessible, engaging, and fun through short, game-like lessons. Users can practice reading, writing, listening, and speaking skills across dozens of languages ranging from Spanish and French to fictional languages like High Valyrian. The platform utilizes spaced repetition, immediate feedback, and motivational streaks to encourage daily practice and long-term retention. Its tiered freemium model allows anyone to learn at no cost, while premium subscriptions offer ad-free learning and offline downloads.