Which language learning app pioneered the 'gamification' approach to language acquisition and reached 500 million downloads by introducing the 'streak' feature to keep users engaged daily?

The language learning app market has revolutionized how people approach linguistic studies. Behind these successful applications are fascinating product design choices, marketing strategies, and retail innovations that have shaped an industry now worth billions. Test your knowledge about one of the most successful language learning products that changed the landscape of digital education and achieved remarkable retail success.

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Duolingo
Babbel
Rosetta Stone
Memrise