Which language learning app first pioneered the 'freemium' subscription model with a 'streak' feature that gamified daily practice and significantly changed user retention in the industry?

The language learning software market has evolved dramatically over the past decade, with subscription-based apps transforming how people access linguistic education. Different models have emerged to meet various learning styles and motivations, from gamified approaches to AI-powered conversation practice. This poll tests your knowledge about a significant turning point in language learning app subscription models.

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Duolingo
Babbel
Rosetta Stone
Memrise