Which pricing innovation did Duolingo pioneer that revolutionized the language learning app market?

In the competitive world of language learning applications, pricing strategies can make or break market success. Different companies employ various approaches to monetize their products while balancing accessibility and profitability. This trivia question explores how major language learning platforms have implemented innovative pricing models to capture market share and drive user engagement. Test your knowledge about the business side of language technology!

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The freemium model with a free core experience supported by ads and optional premium subscription
Pay-per-language pricing where users purchase individual language courses separately
Time-based pricing where users pay only for the minutes they actively use the app
Certification-based pricing where the app is free but official language proficiency certificates cost money