0001562088 2021-11-10 2021-11-10 0001562088 false NASDAQ 8-K 2021-11-10 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 NASDAQ true false 2021-11-10 2021-11-10