Which language learning product launch in 2012 was revolutionary for introducing gamification and adaptive learning algorithms based on cognitive science research?

In the world of language learning products, one groundbreaking launch revolutionized how people approach foreign languages. This product combined innovative technology with linguistic science to create a new category in language acquisition tools. Test your knowledge about this significant product launch that changed the language learning industry forever.

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Duolingo
Rosetta Stone Version 4
Babbel Mobile
Memrise Pro