Which language learning platform first introduced the gamified 'streak' concept that revolutionized user retention and is now widely copied across the industry?

In the world of language learning and linguistics, certain brands have revolutionized how we approach language acquisition and translation. From innovative apps to groundbreaking AI translation tools, these companies have shaped modern linguistic education and communication. This poll tests your knowledge of a fascinating linguistic product milestone that changed how millions interact with foreign languages.

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Duolingo
Rosetta Stone
Babbel
Memrise