Palettator

Palettator is a floating panel and you can put stuff in it and sample colors. Create palettes and gradient maps from images! Place your palette, reference image or your cat on it. The panel is visible in fullscreen mode, floats above documents. Toggle visibility with hotkey, export dominate colors to swatches, create Gradient Maps and Gamut masks from images. Note that it won't work on M1 Macs in Native PS.