Which language learning platform pioneered the 'hearts' system as part of its freemium model, where users lose hearts for incorrect answers and must either wait for them to regenerate or subscribe to continue learning?

The language learning app market has exploded in recent years, with various subscription models competing for linguistic enthusiasts. Behind these apps are fascinating business strategies that balance accessibility with profitability. This poll tests your knowledge about how major language learning platforms monetize their services and engage users through innovative subscription approaches.

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Duolingo
Babbel
Rosetta Stone
Memrise