According to industry research, which pricing strategy has shown the highest user retention rates for language learning applications?

In the competitive world of language learning applications, pricing strategies can make or break a product's success. Different companies have experimented with various approaches to monetization, from freemium models to tiered subscriptions. This trivia question explores which pricing strategy has proven most effective for user retention specifically in language learning apps, based on industry research from 2022-2023.

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Freemium with premium unlock of all languages
Microlearning-based pricing (pay per completed lesson set)
Achievement-based tier unlocking (skills-based progression pricing)
Annual subscription with quarterly content updates