Alt Tab Colorful is a Blender add-on built to save and use your commonly used colors and color palettes directly inside Blender. It keeps your saved colors and palettes on hand within Blender, ready to use as you work.
The add-on runs on Blender 4.0 through 5.0 and is listed as Blender Extension compatible, fitting into Blender's add-on and extension setup. It's released under the GPL license, and its developer, Alt Tab, is a Blender Development Fund contributor. It carries a rating of 4 from a small number of reviews on its source listing.
Documentation is provided by the developer to help with setup, and a demo video is available if you want a look before installing. As a color-focused Blender add-on, Alt Tab Colorful keeps your saved colors and palettes inside the application where you use them.