twentyfifteen vs twentytwentyone

twentytwentyone is used by more websites in our catalog: 193 use twentyfifteen and 655 use twentytwentyone.

twentyfifteen sites have the higher median Ahrefs Domain Rating (twentyfifteen: 19, twentytwentyone: 18).

Between 2026-06 and 2026-07, twentyfifteen went from 0.02% to 0.02% of all tracked sites, while twentytwentyone went from 0.08% to 0.07%. twentyfifteen is gaining ground faster in our index.

No. A site runs a single WordPress theme, so twentyfifteen and twentytwentyone are mutually exclusive.

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.