CodeKit is "ok". But I prefer 100 times to use the command line for this kind of things.
Also LiveReload allows you to run it on another sevrer.
With LR, I actually had to un-train myself from constantly reloading the browser window. Now I just save a file in my IDE, and LR does it for me. I couldn't imagine going back to anything else.
And in case of CSS LR does not even reload the page, it injects CSS.
Very handy for styling some "in between" elements—popovers and stuff like that.