Gatling is a free, open-source performance testing tool. It was first released 2012 and has since gained in popularity. In addition to its free tools, Gatling offers a wide range of (commercial) professional services. Gatling is mainly implemented with the Scala programming language (as opposed to Java). In contrast to JMeter’s XML-based test scripts, Gatling creates scripts in Scala, which makes it more convenient for editing scripts with independent IDEs. Another benefit over JMeter, is that Gatling has better built-in support for WebSocket communication.