Language learning apps digital ad spending in the U.S. 2021
most successful language learning app worldwide, with a revenue approximately three times higher than that of the runner-up Babbel.
Between January and August 2021, language learning app Rosetta Stone invested 9.6 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