Gitcolor is a Chrome extension developed by rcmtcristian. It falls under the category of Browsers, specifically Add-ons & Tools. This free extension allows users to set different themes to the GitHub contribution graph, enabling them to change the colors of their contribution graph on GitHub.

With Gitcolor, users can colorize the contribution graph and legend, as well as the activity overview graph and activity listing progress bar. Installing the extension is simple. Once installed, users can click on the extension icon to open it. From there, they can select one of the available themes and use the left paint bucket to choose their desired color. The right paint bucket is then used to apply the selected color.