When comparing ColorGrab vs Pick, the Slant community recommends Pick for most people. In the question“What are the best color picker tools for Linux?” Pick is ranked 1st while ColorGrab is ranked 2nd.
Ranked in these QuestionsQuestion Ranking
Pro Mutliple color models
Can display RGB, HSL, HSV, and CMYK values.
Can be used on other operating systems as well.
Pro Free and open source
Licensed under the MIT license with source code available on GitHub.
Pro Very easy to use
Pro Saves information about the color so you won't need to recheck in the future
Pick will save information about the color, such as the name and value, along with a screenshot to remind you where you got the color from.
Pro Has a color converter
Con Picked color cannot be modified in same tool
Only pick, convert and copy are possible
Con Doesn't work on debian
Sliders won't move, just can't do anything with it.