[geuis]

This could be an interesting companion to Helium. Helium-css can be used on live sites to find unused CSS. Combine with this project to remove duplicates too. https://github.com/geuis/helium-css

[kevinconroy]

This may be the single most helpful comment I've found on Hacker News. I've been looking for a tool like Helium for a while. Thank you!

[ajtaylor]

I'll echo the sibling commenter. We're in the process of rolling out a new site layout at $work and I suspect there is a LOT of leftover CSS rules which I can get rid of. Thanks very much for the link!