Which language learning product launch in 2012 introduced the gamified 'streak' feature that has since become standard across most language learning platforms?

The language learning market has seen countless innovations over the decades, but some product launches have fundamentally transformed how we approach language acquisition. From traditional textbooks to AI-powered applications, the evolution has been remarkable. This trivia question focuses on a pivotal moment in language learning technology that revolutionized accessibility and effectiveness for millions worldwide.

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Duolingo
Babbel
Rosetta Stone Mobile
Memrise