Semantic UI vs W3.CSS

W3.CSS is used by more websites in our catalog: 277 use Semantic UI and 1,051 use W3.CSS.

Semantic UI sites have the higher median Ahrefs Domain Rating (Semantic UI: 40, W3.CSS: 23).

Between 2026-06 and 2026-07, Semantic UI went from 0.04% to 0.03% of all tracked sites, while W3.CSS went from 0.13% to 0.12%. Semantic UI is gaining ground faster in our index.

1 websites in our catalog use both Semantic UI and W3.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.