Which language learning platform first pioneered the use of adaptive AI to create personalized learning paths based on native language interference patterns?

Language platforms have revolutionized how we learn, communicate, and engage with different cultures. Behind these innovations are companies with unique marketing approaches that have shaped the language learning industry. Test your knowledge about the marketing strategies and retail innovations that helped certain language platforms rise to prominence in the global market.

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Duolingo's 'Language Brain' system (2015)
Babbel's 'Cognitive Recognition' technology (2016)
Rosetta Stone's 'TruAccent' speech recognition (2014)
Lingvist's 'Computational Linguistics' algorithm (2013)