Duolingo Inc. Class A Common Stock. Replay the stock market charts of DUOL day by day, back to 2003. Open long and short positions without spending any money. Duolingo, Inc. develops a language-learning website and mobile app in the United States and China. The company offers courses in 40 different languages, including Spanish, English, French, Japanese, German, Italian, Chinese, Portuguese, and others. It also provides a digital language proficiency assessment exam. The company was incorporated in 2011 and is headquartered in Pittsburgh, Pennsylvania.
