Apps similar to Ruler include xScope. It's paid, but Red Lines Tools and Designer Tools are free. In total there are three Color Picker Tools like Ruler for Mac and Windows.
Created for designers by ARTIS Software & The Iconfactory, xScope is a powerful set of tools that are ideal for measuring, aligning and inspecting on-screen graphics and layouts. Quickly available via the Mac OS X menu bar, xScopes flexible tools float above desktop windows...
This is a collection of tools created to help developers and designers build and inspect UI. But a lot of flexible settings make this app useful for a wide range of users.
Designer Tools is intended to help designers and developers with routine work. It contains a loupe tool that helps you copy the color of any pixel on the screen.
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