Which pricing innovation by Duolingo transformed the language learning app market and became widely adopted by competitors?

High-end language learning platforms and linguistic tools employ various pricing strategies to position themselves in the market. Some opt for premium pricing to signal quality, while others use psychological pricing tactics that leverage our cognitive biases. This poll tests your knowledge of how language product companies have approached pricing in the competitive education technology landscape. Can you identify which innovative pricing approach revolutionized the language learning app industry?

This is a live public trivia poll on AIPolls.Net. Vote and see real-time results.

Freemium model with a free core product and premium subscription (Duolingo Plus/Super)
Time-limited pricing where courses become more expensive the longer you take to complete them
Fluency-based pricing where users only pay when they achieve certified proficiency levels
Regional adaptive pricing that automatically charges based on local language difficulty ratings