Which language learning app first pioneered the 'freemium' subscription model with a 'streak' feature that gamified daily practice?

Language learning apps have transformed how people acquire new languages, moving from traditional classroom settings to interactive digital experiences. These product innovations have made language learning more accessible and engaging than ever before. This poll tests your knowledge about a groundbreaking subscription model that revolutionized the language learning industry.

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Duolingo
Rosetta Stone
Babbel
Memrise