Foundation vs Pure CSS

Foundation is used by more websites in our catalog: 8,731 use Foundation and 816 use Pure CSS.

Foundation and Pure CSS sites have a similar median Ahrefs Domain Rating.

Between 2026-06 and 2026-07, Foundation went from 1.1% to 0.99% of all tracked sites, while Pure CSS went from 0.11% to 0.09%. Pure CSS is gaining ground faster in our index.

14 websites in our catalog use both Foundation and Pure CSS.

Adoption is counted from Site Stats Database's own crawl; Domain Rating comes from Ahrefs and traffic from DataForSEO. Figures reflect the sites we track and refresh at least monthly.