Which CEO pioneered the 'freemium' subscription model for language learning apps that revolutionized the industry by offering basic services for free while charging for premium features?

In the world of language learning and linguistics, retail innovation has transformed how we access and consume language products. From traditional dictionaries to AI-powered language learning apps, companies have revolutionized their approach to meet changing consumer needs. This poll tests your knowledge about a significant retail innovation in the linguistics industry that changed how we interact with language learning products.

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• Luis von Ahn (Duolingo)
• Mikkel Svane (Babbel)
• Jan Koum (Tandem)
• Elon Musk (Lingvist)

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