Which company pioneered the use of spaced repetition algorithms in language learning apps, revolutionizing vocabulary acquisition with their adaptive flashcard system?

Test your knowledge about groundbreaking innovations in language learning technology! The language learning market has transformed dramatically over the past decade with new approaches to acquisition, practice, and assessment. Major companies have revolutionized how we learn languages through mobile apps, AI technologies, and adaptive learning systems. How well do you know the companies that pioneered these innovations?

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Duolingo
Anki/SuperMemo
Rosetta Stone
Babbel