Grammarly is an app that automatically detects potential grammar, spelling, punctuation, word choice, and style mistakes in writing. Grammarly’s algorithms flag potential issues in the text and suggest context-specific corrections for grammar, spelling, wordiness, style, punctuation, and plagiarism. It is available via a browser extension for Chrome, Safari, Firefox, and Edge. Grammarly is available as an app for both iOS and Android; a premium service is available for a monthly payment.
It was developed in 2009 by Ukrainians Alex Shevchenko and Max Lytvyn, in Kiev. The backend grammar engine is written in Common Lisp. The app is owned by Grammarly Inc of San Francisco area, California.
In 2018, a security bug was discovered in the desktop web browser extension version of Grammarly that allowed all websites access to everything the user had ever typed into the Grammarly Editor. This bug was rapidly fixed. Grammarly said it has no evidence that the security vulnerability was used to access any customers’ account data.
On October, 2018, Grammarly announced support for Google Docs.