Duolingo Privacy Policy

Duolingo's Privacy Policy describes what personal information Duolingo collects about you and how it uses, stores, and shares it. By using Duolingo, you agree that it may record what you type or say, use that to train its own AI, and share your information with advertising partners like Meta and Google for personalized ads. Your profile is public by default, and if you join a classroom, your teacher gains significant access to your account including the ability to log in as you.

Duolingo's Privacy Policy establishes the terms under which Duolingo collects, retains, uses, and shares personal information submitted by users of its Service. The policy permits Duolingo to record and store user-submitted text and audio for product improvement and AI model training, and to share that content with named third-party AI vendors (OpenAI, Google) subject to contractual restrictions barring those vendors from using personal information for their own purposes. For adult users, Duolingo may share personal information with named marketing analytics providers (Unity, Meta, LiftOff, Pangle, Moloco, Google) for personalized advertising, enabled in part through third-party Targeting Cookies from Google, Meta, Amazon, and others that track users across multiple websites. Children under 13 receive distinct treatment: data collected from them is limited to internal operations, third-party behavioral tracking is disabled, and advertisements served to them are non-personalized and restricted to family-safe content. User profiles default to fully public visibility, and in classroom contexts teachers are granted the ability to view account credentials, reset passwords, and log in as the student.

For an ordinary user, this document means that using Duolingo constitutes agreement to broad data collection and sharing practices, including the use of text and audio you submit to train Duolingo's proprietary AI models and the sharing of that content with third-party AI vendors. Your personal information may also be shared with multiple named marketing analytics companies for personalized advertising, and third-party Targeting Cookies placed through Duolingo may track your activity across other websites. Your profile is visible to everyone on the internet by default — you can adjust your profile visibility settings to limit this public exposure. Children under 13 receive stronger protections: their data is used only for internal operations, behavioral tracking by third parties is disabled, and they see only non-personalized, family-safe ads.