Which retail language learning brand first introduced the 'adaptive learning algorithm' that personalizes lessons based on individual speaking patterns and common mistakes?

The language learning and linguistics retail market has seen remarkable innovations in product development and marketing strategies. From AI-powered language learning apps to culturally authentic language immersion tools, companies have employed unique approaches to capture market share in this growing industry. Test your knowledge about a groundbreaking product development strategy that changed how language learning tools are marketed and sold.

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Rosetta Stone with its Dynamic Immersion technology (2010)
Duolingo with its CEFR-aligned Adaptive Learning Engine (2016)
Babbel with its Speech Recognition Curriculum System (2014)
Pimsleur with its Graduated Interval Recall algorithm (2012)