Which language learning platform was the first to introduce a freemium subscription model with a 'streak' gamification system that rewarded daily practice?

The language learning and linguistics industry has been transformed by subscription models over the past decades. From physical language learning materials to digital platforms and AI-powered tools, companies have found innovative ways to monetize language education. This poll tests your knowledge about a pioneering subscription model that changed how people learn languages. Can you identify which company first introduced this revolutionary approach?

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Duolingo
Rosetta Stone
Babbel
Pimsleur