WebSocket Test Client is a free Chrome add-on developed by Rage App. As its name suggests, it is a simple tool designed to help users test WebSocket services. With this add-on, users can construct custom WebSocket requests and handle responses, allowing them to directly test the functionality of their WebSocket services.

Using WebSocket Test Client is straightforward. Users simply need to enter the URL of their WebSocket server and click "Open" to establish a connection. They can then input their request text and click "Send" to send the request to the server. The add-on provides a log that displays the response messages received from the server, making it easy to track and analyze the server's responses.

Overall, WebSocket Test Client is a valuable tool for developers and testers who need to test and debug WebSocket services. Its simplicity and ease of use make it a reliable choice for anyone working with WebSocket technology.