Which pricing innovation did Duolingo introduce in 2017 that transformed the language learning app market and was later adopted by many competitors?

In the language learning and linguistics technology market, pricing strategies have evolved significantly over the past decade. As AI and machine learning capabilities transform language products, companies have had to rethink how they monetize their offerings. This poll explores how one major language learning platform revolutionized its pricing approach, setting a trend that many competitors later followed.

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Tiered subscription model with a free tier supported by ads (Duolingo Plus/Super)
Pay-per-lesson microtransactions
Corporate licensing packages for businesses
One-time purchase with lifetime updates