A simple yet handy design and image tool, Color Decoder can help you identify colors in any application or document. Its radar will display all colors on the screen, organized in Light, Moderate, Heavy and Extreme. From the settings, you can choose how to show a selected color on your screen. Color Decoder can flash all pixels of the same color, bring up the color's name, or even speak it using Mac's text-to-speech technology.
Color Decoder features a magnifier, which appears next to your cursor. While some people might like this, I much prefer the magnifier focusing in right on where my cursor is. You'll find this tool really useful to inspect pixels though. You should also know that it works on multiple monitors. In terms of performance we suffered a few jams with the application, especially when all the color settings were selected.
Color Decoder is a great tool to detect similar color areas on a screen.