Which subscription-based language learning platform was the first to implement an adaptive learning algorithm that customizes content based on individual performance?

Language learning and linguistics have been transformed by technology in recent years. Subscription models have particularly changed how people access language learning resources, creating new opportunities and challenges for both businesses and consumers. Test your knowledge about how subscription services have revolutionized the language learning industry!

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Duolingo
Babbel
Rosetta Stone's Catalyst
Memrise