Which language learning platform first introduced 'streak maintenance' features that significantly boosted user retention and brand loyalty through gamification?

Language technologies have transformed how brands communicate with customers across cultures and languages. This trivia question explores how major language learning platforms have innovated their product offerings to build brand loyalty in an increasingly competitive market. Test your knowledge about how these companies have adapted their business models and technologies to maintain their customer base.

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Duolingo
Babbel
Rosetta Stone
Memrise