DevGuard is a free Chrome add-on designed to assist developers in monitoring and debugging web errors effectively. This tool captures various types of issues, including JavaScript errors, resource failures, and HTTP response errors, in real-time as users browse any website. Its user-friendly interface provides instant visibility into hidden issues that browsers typically suppress, making it invaluable for frontend developers, QA engineers, and performance testers alike.

The add-on features a range of capabilities such as page-level grouping of errors, severity scoring, and color-coded error levels to facilitate easier debugging. Furthermore, DevGuard offers optional AI-powered explanations for each error, which can be enabled with a personal OpenRouter API key. This feature provides users with clear explanations, probable causes, debugging instructions, and recommended fixes, enhancing the overall debugging experience while ensuring privacy and security.