XRebel is an always-on, interactive profiler that runs with your web app. It displays alerts in your browser when discovering issues. XRebel provides real time insight into your application performance metrics and issues – while you code.
From here you have access to the XRebel user documentation, listing proper installation and setup procedures as well as usage scenarios. In addition, you can find a complete list of all browsers, servers and JDBC drivers currently supported by XRebel.