Which language learning app first introduced the 'streak' feature that gamified daily practice, now widely copied across the language learning industry?

The language learning app market has exploded in recent years, with several companies revolutionizing how people learn new languages through innovative product development strategies. These apps have transformed traditional language education by incorporating gamification, AI-powered feedback, and personalized learning paths. Test your knowledge about a significant product development milestone that changed the language learning retail landscape.

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Duolingo
Babbel
Rosetta Stone
Memrise