Duolingo’s green owl logo mascot is named Duo.
Duo represents Duolingo, the language-learning platform founded by Luis von Ahn and Severin Hacker in 2011. The owl was chosen because owls are associated with wisdom and learning, while its bright green appearance gives the brand a highly recognizable visual identity.
The character’s full name is Duo the Owl. It appears in the app icon, website branding, lessons and promotional campaigns. Duolingo has repeatedly updated Duo’s illustration and expressions, but the rounded green owl has remained central to the company’s identity.
People sometimes call the mascot “the Duolingo owl,” which describes the character but is not its proper name. Duo is also distinct from the app’s notification reminders and humorous marketing campaigns: those use the mascot as a character, while the underlying product is the language-learning service.