You don't have to pay any web service or search for an addon, you already have this in Google Chrome under F12 (Inspector)->Audits->Remove unused CSS rules
(Inspector)->Audits->Remove unused CSS rules
Screenshot:
Update: 30 Jun, 2017
Now Chrome 59 provides CSS and JS code coverage. See https://developers.google.com/web/updates/2017/04/devtools-release-notes#coverage
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