Which language learning platform first pioneered the 'freemium' subscription model with streak-based gamification that revolutionized the language education market?

The language learning and linguistic tools market has transformed dramatically in recent years, with subscription models revolutionizing how people access language education and translation services. Major companies have developed innovative approaches to monetizing language technology. This poll tests your knowledge about how subscription models have changed the linguistics industry landscape and created new revenue streams for language service providers.

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Duolingo
Rosetta Stone
Babbel
Memrise