0001562088 2023-02-28 2023-02-28 0001562088 false 8-K 2023-02-28 Duolingo, Inc. DE 001-40653 45-3055872 5900 Penn Avenue Pittsburgh PA 15206 412 567-6602 false false false false Class A common stock, $0.0001 par value per share DUOL false 2023-02-28