TypoGuard – AI-Powered Text Correction for the Web TypoGuard is a Chrome extension that automatically detects and corrects typos and grammar mistakes as you type — inspired by Google's familiar "Did you mean?" experience. Whether you're writing a message, drafting an email, or chatting with an AI assistant, TypoGuard works silently in the background and with a mouse over suggests corrections before you hit send. It is compatible with popular web platforms, including messaging apps and chats.