In what year did Duolingo introduce its premium subscription model 'Duolingo Plus' (later renamed to 'Super Duolingo'), marking a major shift in its business model?

Language learning apps have transformed how we acquire new languages, with subscription-based platforms leading the industry. These services have evolved from simple vocabulary flashcards to comprehensive learning ecosystems with gamification, AI speech recognition, and personalized learning paths. Test your knowledge about one of the most transformative language learning subscription services that changed the industry landscape!

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2011 (same year the app launched)
2017
2014
2020