Which language learning app adopted the famous tagline 'Language learning, gamified' that reportedly cost over $1 million to develop and test before its 2019 global rollout?

In the competitive world of language learning apps and translation software, marketing can make or break a product. Taglines become the memorable hooks that help consumers distinguish between similar offerings. This question tests your knowledge about one of the most successful linguistic product marketing campaigns of the last decade - a tagline that transformed a language learning app into a household name.

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Duolingo
Babbel
Rosetta Stone
Memrise