Color Picker Plus
Color Picker Plus is an extension to the macOS Colors panel.
I have always thought that Apple’s color picker window is quite bad for picking precise colors, especially for working with colors on the web.
I do though like the way the color picker in Photoshop works, where the color is sampled from a color square with brightness and saturation along its width and height. I wanted to mimic that while also making it easy to copy and paste colors from HEX or RGB.
Fortunately, MacOS supports plugins for the color picker window. When a color plugin is installed, a new icon appears in the toolbar.
But at the time, I couldn’t find any good color picker extensions. The only one I could find was a very basic and old one called Hex Color Picker, for making colors directly from HEX values.
So making a better one was a great excuse to learn more about how such extensions actually work.