ColorGrab is described as 'A cross-platform color picker' and is an app in the Photos & Graphics category. There are more than 50 alternatives to ColorGrab for a variety of platforms, including Windows, Mac, Online / Web-based, Linux and iPhone. The best alternative is PicPick. It's not free, so if you're looking for a free alternative, you could try Just Color Picker or gpick. Other great apps like ColorGrab are Instant Eyedropper (Free, Open Source), gcolor2 (Free, Open Source), Sip (Paid) and Colora (Free, Open Source).
PicPick is an all-in-one software for software developers, graphic designers and home user. It has an intuitive interface and simple, elegant operation. After starting the software, you simply select one of the tool from the PicPick Tools trayicon menu when you want.
Instant Eyedropper is a free color detection tool for webmasters that will identify and automatically paste to the clipboard the HTML color code of any pixel on the screen with just a single mouse click.
gcolor2 is a basic colourpicker utility that allows you to select any colour on your screen, and, well, grab it's colour. It also allows you to save the colour you create to a file, which shows up as a list in the application.
The refreshingly simple color picker for developers that instantly samples and encodes any color on your screen. Just one quick click to savor the flavor and you're set! See what’s on special with Sip below.
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, ...)!