Which language learning app pioneered the use of spaced repetition algorithms and gamification to reach over 500 million users worldwide?

The language learning and linguistics industry has undergone significant digital transformation in recent years. New technologies have revolutionized how people learn languages and how linguistic data is processed. This poll tests your knowledge about a major product innovation that disrupted traditional language learning methods.

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Duolingo
Babbel
Rosetta Stone
Memrise