Responsive Viewer is a Chrome extension developed by skmail that allows front-end developers to test multiple screens in one view. This extension is designed to aid developers in testing responsive websites and applications.

With Responsive Viewer, developers can easily view their websites or applications on multiple screens simultaneously. This feature is particularly useful for testing the responsiveness of a design across different devices and screen sizes. By displaying multiple screens in one view, developers can quickly identify any layout or design issues and make necessary adjustments.

The extension is easy to use and provides a seamless experience for developers. It does not track or collect any user data, and it is not connected to any server to store data. This ensures the privacy and security of users' information.

Overall, Responsive Viewer is a valuable tool for front-end developers who need to test the responsiveness of their websites or applications. It simplifies the process of checking multiple screens and helps identify and fix any design issues efficiently.