Grammarly was developed in 2009 by Ukrainians Alex Shevchenko, Max Lytvyn, and Dmytro Lider. The Grammarly software was first released in July 2009 in Kyiv, Ukraine. Grammarly is headquartered in San Francisco, and has offices in Kyiv, New York City, and Vancouver. Grammarly sometimes automatically detects potential grammar, spelling, punctuation, word choice, tone and style mistakes in writing, following standard linguistic prescription, but it also makes mistakes. Algorithms flag potential issues in the text and suggest context-specific corrections for grammar, spelling, wordiness, style, punctuation, and plagiarism, but many of the features are for premium users only. It is available as a web or desktop editor or as a browser extension for Chrome, Safari, Firefox, and Edge, or as an app for both iOS and Android. Premium service is available for a monthly or annual payment. The company also offers an enterprise tool called Grammarly Business.