Overview
Duolingo is a mobile and web language-learning service built around short lessons, practice activities, progress tracking, and game-like rewards. It covers many language courses and also offers learning content beyond languages. Its AI work appears in personalized exercise selection, course-content creation, and learner-facing features in Duolingo Max. The company describes AI conversation practice through Roleplay and Video Call, while human experts review and guide generated lesson content. The service is intended for independent learners using phones or browsers, with free access and paid subscription tiers.