Apps similar to Color UI include gpick, which is free and open source. Other options are Just Color Picker, Sip, Instant Eyedropper and System Color Picker. There's no shortage of Color Picker Tools like Color UI, with more than 50 alternatives for Windows, Mac, the web, Linux and Android.
pastel is a command-line tool to generate, analyze, convert and manipulate colors. It supports many different color formats and color spaces as well as ANSI 8-bit and 24-bit representations.
Color Cop is a multi-purpose color picker for web designers and programmers. It features an eyedropper, magnifier, variable magnification levels, 3 by 3 and 5 by 5 average sampling, snap to websafe, color history, and a 42 color complementary palette.
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HexTo is a complete color toolkit for designers and developers. It lets you convert color formats (HEX, RGB, HSL, CMYK, and more), check accessibility contrast, simulate color vision types, generate harmonies, and export swatches or tokens.
ColorMania is a colorpicker for Windows. It's the perfect solution for previewing, identifying, testing and organizing color values. It can be a very difficult job to get your colors right for a unique or appealing design.
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Pixel Pick is a free color picker tool that pick the pixels color under your mouse cursor on the desktop and translates it into a number of different color formats such as RGB, CMYK, HSB, HEX or Web Color format. A free color picker for grabbing color under your mouse .
ColorSlurp is the ultimate color tool for developers and designers. Pick any color on your screen using the high-precision magnifier. Create and edit colors using advanced selection and editing tools. Organize colors into collections.
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With the pipette you are able to edit, convert and pick up colors from your screen. Pipette also supports a lot of standards or color models (RGB, CMY, CMYK, HSV, TColor and XYZ0). Color models are nothing but theoretical descriptions of colors using certain numeric values.
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With Instant Color Picker (ICP), you can quickly pick colors from screen and store them.
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Chroma is a browser-based color picker that focuses on color selection. It was built using React Color.
DigitalColor Meter is a utility built into Mac OS X for measuring and displaying the colour values of pixels displayed on the screen.
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