Is there a palette app with a movable glass to convert text color code into a color?
 

I have a text with #000000 colors, and I'd like to move a rectangular glass over it and see the color.

It'd be helpful if I could rest the glass, choose another color in the app and have the text be modified accordingly.

hmm, not sure if this is what you are looking for but bluefish has a color picker utility that lets you type in a hex color, hilight it, right click and hit 'edit color' and it will allow you to use an eyedropper anywhere on the screen to get a color value for that given pixel.

That does it, although with a slightly different interface. Thanks. The interface I described would reduce the amount of clicking. I think colorzilla's eyedropper could be modified to do this. Another possible version could consist of highlighting the color codes in their own colors - this would help quickly get an idea of what colors are present and where. Btw, you don't have to highlight the code.