An app- and web-based language-learning service built around short, gamified lessons.
On February 11, 2025, Duolingo announced its owl mascot Duo had been killed by a Cybertruck. Users who opened the app found Duo's corpse, eyes replaced with Xs. Mentions hit 169,000 in two weeks, Dua Lipa mourned publicly, and a staged mascot death became the brand's biggest publicity win.