Which language learning subscription platform pioneered the 'streak' gamification feature that significantly increased daily user engagement and became widely copied across the industry?

The language learning industry has undergone significant transformation with the advent of subscription-based models. These platforms have revolutionized how people access language education, moving from traditional one-time purchases of textbooks and software to recurring subscription services offering continuous content updates and personalized learning experiences. This poll tests your knowledge of this evolving business model in the linguistics industry.

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Duolingo
Babbel
Rosetta Stone Plus
Busuu