Duolingo

Duolingo is a language learning platform accessed through a mobile app and a website, used by learners to study languages through short, gamified lessons. It reaches an audience focused on education, across app and web channels.

Lessons are structured as short exercises covering reading, listening, and speaking, and progress is tracked through streaks and levels that encourage regular practice over time.

Advertising formats include Brand Campaigns, Full-screen video ads, and Character intros that introduce a sponsor alongside Duolingo's mascot characters, plus Sponsored characters that place a brand within the app's cast. Its ads.txt file lists 1 authorized ad system, sold directly.