Which language learning app was the first to introduce the 'streak' feature that gamified daily practice and became widely copied across the industry?

The language learning industry has transformed dramatically in the digital age. Mobile apps have revolutionized how we acquire new languages, making learning more accessible than ever before. But how well do you know the marketing history behind these linguistic innovations? Test your knowledge about the campaigns and milestones that shaped modern language learning technology!

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Duolingo
Rosetta Stone
Babbel
Memrise