Which language learning platform pioneered the freemium subscription model with 'streaks' as a gamification element to boost daily user engagement and retention?

Language learning platforms have transformed dramatically in the digital age, shifting from one-time purchase products to sophisticated subscription models. This shift has not only changed how users access content but has fundamentally altered how language learning materials are designed, updated, and personalized. Test your knowledge about this significant business model transition in the language learning industry!

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Duolingo
Rosetta Stone
Babbel
Memrise