Custom Host Banner is a free Chrome add-on developed by andyb that allows users to display a custom banner on web pages based on the host. This tool is particularly useful for developers, QA engineers, and others who frequently switch between different environments that may look similar.

With Custom Host Banner, users can set up unique banners for each host, specifying different colors and text. This helps users easily identify where they are and prevents accidental changes to the wrong site. By displaying a distinct banner for each host, users can quickly and visually differentiate between production sites and test sites, improving efficiency and reducing the risk of errors.

To get started, simply install the Custom Host Banner add-on from the Chrome Web Store. The code for this add-on is also available on GitHub for those interested in exploring or contributing to its development.