The System Color Picker by Sindre Sorhus is an excellent alternative to my ColorSlurp. The System Color Picker is a free tool as opposed to the very expensive ColorSlurp. Yet, System Color Picker has excellent features, such as:

• picking a color with a magnifying glass by using a keyboard shortcut that can be freely configured,
• showing and hiding the app window with a freely configurable keyboard shortcut,
• support of color formats Hex, HSL, RGB, OKLCH and LCH,
• defining a preferred color format,
• creating color palettes,
• a set of four starting palettes (Apple, Crayons, System, Web Safe Colors).