grammarly is an online text editor based on artificial intelligence. the editor checks spelling, grammar, punctuation and other mistakes. established in 2009 by ukrainians alex shevchenko, max lytvyn, and dmytro lider. in 2018, grammarly launched the beta version. as of 2022, it is available as a browser extension. the company is headquartered in san francisco, california, usa. the company's offices are located in kyiv, new york and vancouver.