Which subscription-based language learning platform pioneered the 'freemium' business model in language education, offering basic courses for free while charging for premium features?

The language learning industry has undergone significant transformation with the rise of digital platforms and subscription models. Companies have innovated in how they package, price, and deliver language education to global audiences. This poll tests your knowledge about a groundbreaking retail innovation that changed how people access language learning resources worldwide.

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Duolingo
Rosetta Stone
Babbel
Memrise