Which innovative pricing strategy helped Duolingo become one of the most successful language learning platforms while maintaining its core product free for users?

In the world of language learning products, marketing strategies often make or break success. One particular language learning platform revolutionized the industry through an innovative pricing strategy that changed how consumers perceived the value of language acquisition tools. This trivia question explores a fascinating intersection of linguistics product marketing and consumer psychology that transformed an entire market segment.

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Freemium model with premium subscription (Duolingo Plus/Super) for ad-free experience and additional features
Time-limited free trials followed by mandatory subscription
Pay-per-lesson model with volume discounts for purchasing multiple language courses
One-time purchase with lifetime access and annual paid upgrades for new languages