Chameleon is a free Chrome add-on developed by Stefan Ritter. It falls under the category of browsers and specifically belongs to the subcategory of add-ons and tools.

Chameleon is designed to help web developers and designers quickly test the responsiveness of their web applications. With Chameleon, users can easily view their web app in multiple device viewports, allowing them to see how their site behaves on different screen sizes.

One of the key features of Chameleon is the ability to simultaneously review the site's behavior in both portrait and landscape orientations for each device. This allows developers to get a comprehensive understanding of how their site adapts to different screen orientations.

Additionally, Chameleon allows users to add and configure as many viewports and devices as needed, providing flexibility and customization options.

If you're a web developer or designer looking for a simple and efficient way to test the responsiveness of your web app, Chameleon is a valuable tool to consider.