Which language learning product famously introduced 'streaks' as a gamification element that revolutionized user engagement and retention in language learning apps?

The language learning and linguistics industry has undergone massive transformation through digital innovation. Traditional dictionaries and language learning tools have evolved into sophisticated platforms and applications that leverage AI, machine learning, and interactive technologies. How well do you know the major product innovations that have reshaped how we learn, translate, and engage with language?

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Duolingo
Rosetta Stone
Babbel
Memrise