Which language learning app pioneered the 'freemium' gamified approach with a major 2011 product launch that emphasized 'bite-sized' daily lessons and used behavioral psychology to drive user retention?

In the evolving world of language technology, product launches have transformed how we interact with communication tools. From voice recognition to translation services, companies have employed various strategies to introduce their linguistic innovations to the market. This poll tests your knowledge about a significant product launch that changed how we approach language learning and communication across cultures.

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Duolingo
Babbel
Rosetta Stone
Memrise