Which pricing innovation revolutionized the language learning app industry around 2011-2012, leading to massive user growth?

In the language learning industry, pricing strategies have evolved dramatically over the past decade. Companies have experimented with various models to monetize language education while keeping it accessible. This trivia question examines a significant pricing innovation that disrupted traditional language learning business models and changed how millions access language education worldwide. Test your knowledge of this industry-changing approach!

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Freemium model with core features free and premium content behind paywalls
Subscription-only model with tiered pricing based on number of languages
Pay-per-lesson model with certified instructors
One-time purchase with lifetime access to all languages