Which language learning platform first introduced 'adaptive spaced repetition' as a core feature of its product design, revolutionizing vocabulary retention for language learners?

Test your knowledge about the intersection of e-commerce and language learning! The language learning market has transformed dramatically with digital platforms creating innovative products and services. From subscription-based apps to AI-powered tutoring systems, language learning has become a thriving product category with unique marketing strategies and consumer trends. Can you identify which language learning platform pioneered a specific innovative feature?

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Duolingo
Anki
Rosetta Stone
Babbel