Rated 3 out of 5 stars
Seems to work great for RGB codes, but I could not find the way to get the hex code to copy. It gives the impression that this would work easily so that is the only reason i didn't give it a higher score :)This review is for a previous version of the add-on (1.2).
New version does that now.
In version 1.3, I added the option to set which encoding you want via the Add-ons Options panel.