Which e-commerce platform first introduced AI-powered 'adaptive language learning' that customized courses based on individual speaking patterns and error types?

The language learning and translation industry has been transformed by technology in recent decades. E-commerce platforms specifically designed for linguistic products have created entirely new markets and learning opportunities. This poll tests your knowledge about a significant innovation in the language technology marketplace that changed how millions access language learning tools.

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Duolingo's Language Store (2015)
Rosetta Stone's Dynamic Immersion Marketplace (2013)
Babbel's Linguistic Marketplace (2016)
Lingoda's Virtual Language Exchange (2017)