Which language learning platform pioneered the 'hearts system' subscription model, where free users have limited daily attempts (hearts) while premium subscribers get unlimited practice?

In the competitive world of language learning platforms, subscription models have transformed how people access linguistic education. From freemium tiers to premium partnerships, companies have developed innovative approaches to monetize language learning while balancing accessibility with profitability. This trivia question explores how one major player revolutionized the language learning subscription landscape with a particularly innovative model.

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Duolingo
Babbel
Rosetta Stone
Memrise