ImageHues is described as 'Natural, fresh color palettes from random beautiful images. ImageHues provides a practically endless library of color palettes by grabbing colors from Unsplash photos. Simply click on colors from the extracted palettes to copy to your clipboard for use elsewhere' and is an website in the Development category. There are more than 25 alternatives to ImageHues, not only websites but also apps for a variety of platforms, including Mac, Windows, iPhone and iPad. The best alternative is Just Color Picker, which is free. Other great sites and apps similar to ImageHues are gpick (Free, Open Source), Colorpicker (Free, Open Source), Paletton (Free) and TinEye Color extraction (Free).
Colorpicker is efficient through its interface. Every features are accessible from the toolbar and shortcuts. You have the possibility to choose any color thanks to the three RGB sliders (soon HSL, CMYK, ...)!
Pika (pronounced pi·kuh, like picker) is an easy to use, open-source, native colour picker for macOS. Pika makes it simple to quickly find colours on screen, in the format you need, so you can get on with being a speedy, successful designer.