Which language learning app first popularized the 'freemium' model with a gamified approach that revolutionized the language education market?

In the fascinating intersection of linguistics and retail, companies have turned language itself into a marketable product. From dictionaries to language learning apps, the commercialization of linguistic knowledge has created a multi-billion dollar industry. This poll tests your knowledge about the business side of language products and the marketing strategies that have shaped how we consume and learn languages in the modern era.

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Duolingo
Rosetta Stone
Babbel
Memrise