Which language learning company first pioneered the freemium subscription model that transformed the industry from one-time purchases to recurring revenue?

Language learning platforms have transformed how we acquire new languages, moving from traditional one-time dictionary and textbook purchases to subscription-based models. This transformation has reshaped the linguistics industry, allowing for more interactive, adaptive, and continuously updated content. This poll tests your knowledge about a pivotal moment in this evolution that changed how millions access language learning resources worldwide.

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Duolingo (2011)
Rosetta Stone (2009)
Babbel (2008)
Busuu (2010)