Chromatic Figma lets you use other color spaces than RGB, such as Lab and Lch, to create good-looking and perceptually uniform gradients and color scales. Those are color spaces that, unlike RGB, was created to mirror the visual response of the human eye. That makes them very well suited for interpolating colors, and often produces more natural looking and aesthetically pleasing results.
Chromatic Figma -> Fix Gradient This command will take the gradient of the selected shape and add new color stops to create a (in many cases) more aesthetically pleasing one.
Chromatic Figma -> Create Color Scale This command will create a customizable scale between the fill colors of two selected shapes (or colors chosen using color pickers in the popup)