Which language learning app first introduced the 'crown level' progression system and streak-based learning in 2017, significantly boosting user retention through gamification?

The language learning software market has exploded in the past decade, with innovative product launches transforming how people acquire new languages. These apps have revolutionized traditional learning methods through gamification, AI-powered personalization, and social features. Test your knowledge about a major product innovation that changed the language learning landscape!

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Duolingo
Babbel
Rosetta Stone
Memrise