Which language learning app first introduced the subscription-based 'freemium' model that has now become standard across the industry?

Language learning apps have revolutionized how people acquire new languages, creating a booming market within the linguistics industry. These digital platforms have transformed traditional language education into accessible, gamified experiences that millions use daily. This poll tests your knowledge about consumer trends in language learning technology and how these products are marketed to different demographics worldwide.

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Duolingo (2011)
Babbel (2007)
Rosetta Stone (2006)
Memrise (2010)