Yoast SEO is the more common of the two in our index: it runs on 4,719 websites against 41 for PixelYourSite, and 25 sites use both. Counts come from real scans, not vendor claims.
PixelyourSite is now probably the most complex tracking tool for WordPress, managing the Facebook Pixel, Google Analytics, Google Ads Remarketing, Pinterest Tag, Bing Tag, and virtually any other script.
Yoast SEO is a search engine optimisation plugin for WordPress and other platforms.
25 sites run both PixelYourSite and Yoast SEO. That is 61% of the sites using PixelYourSite, the smaller of the two.
Want to know which one a particular site uses? Look it up and see its whole stack, or compare two sites side by side.