Which popular language learning app was originally developed as an internal tool for Duolingo's founder to help his housekeeper learn English?

In the intersection of linguistics and retail, language technology companies have become significant players in the global market. From translation services to language learning apps, these brands have transformed how we communicate across languages. Test your knowledge about these famous language-focused products and their surprising origins!

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Duolingo
Babbel
Rosetta Stone
Memrise