Which language learning subscription service first introduced the 'freemium' model with a gamified 'streak' system that rewards daily practice?

Language learning platforms have revolutionized how we acquire new languages, with subscription models driving much of the industry's growth. These services have transformed from simple vocabulary flashcards to sophisticated AI-powered learning ecosystems. Test your knowledge about the business models behind the tools that help millions communicate across linguistic boundaries.

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Duolingo
Babbel
Rosetta Stone
Memrise