Which innovative pricing strategy did Duolingo initially use to differentiate itself from traditional language learning products while building its massive user base?

The language learning software market reached $18.7 billion in 2023 and is projected to grow at a CAGR of 17.2% through 2030. Behind these impressive numbers lie fascinating pricing strategies that have revolutionized how we access language education. This poll tests your knowledge of how one major player disrupted traditional language learning pricing models to achieve massive market penetration.

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Freemium model with core learning free and premium features (like offline access and no ads) requiring subscription
Monthly subscription tiers based on number of languages accessed (e.g., $5.99 for one language, $9.99 for three languages)
Pay-per-lesson model where users purchase individual language modules as needed
One-time purchase with lifetime access to all language courses and features