Between January and August 2021, language learning app Rosetta Stone invested *** million U.S. dollars in digital advertising, while Duolingo's ad spending stood at under half a million in the same period. In April 2021, Duolingo was the most successful language learning app worldwide, with a revenue approximately times higher than that of the runner-up Babbel.
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Pathmatics. (August 24, 2021). Digital advertising spending of selected language learning apps in the United States between January and August 2021 (in million U.S. dollars) [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved July 15, 2026, from /statistics/1260378/language-learning-apps-digital-ad-spend/
Pathmatics. "Digital advertising spending of selected language learning apps in the United States between January and August 2021 (in million U.S. dollars)." Chart. August 24, 2021. ÌÇÐÄÆƽâ°æ. Accessed July 15, 2026. /statistics/1260378/language-learning-apps-digital-ad-spend/
Pathmatics. (2021). Digital advertising spending of selected language learning apps in the United States between January and August 2021 (in million U.S. dollars). ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 15, 2026. /statistics/1260378/language-learning-apps-digital-ad-spend/
Pathmatics. "Digital Advertising Spending of Selected Language Learning Apps in The United States between January and August 2021 (in Million U.S. Dollars)." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 24 Aug 2021, /statistics/1260378/language-learning-apps-digital-ad-spend/
Pathmatics, Digital advertising spending of selected language learning apps in the United States between January and August 2021 (in million U.S. dollars) ÌÇÐÄÆƽâ°æ, /statistics/1260378/language-learning-apps-digital-ad-spend/ (last visited July 15, 2026)
Digital advertising spending of selected language learning apps in the United States between January and August 2021 (in million U.S. dollars) [Graph], Pathmatics, August 24, 2021. [Online]. Available: /statistics/1260378/language-learning-apps-digital-ad-spend/
