You're correct that they're very similar; PurgeCSS even describes itself as an improvement to PurifyCSS. (Purge tries to actually parse for matches, whereas Pur

You're correct that they're very similar; PurgeCSS even describes itself as an improvement to PurifyCSS. (Purge tries to actually parse for matches, whereas Purify just looks for the presence of words -- so if you have a .arrow CSS rule in your framework, and you happen to use the word 'arrow' in body text somewhere, Purify will needlessly include that style in its output). But yes, I actually use both tools in series. I get a small reduction from Purifying the output of Purge (I haven't actually bothered to diff it to see where), and Purify stitches the files together and minifies in addition to pruning.