bb-theme-child vs twentytwentyone

twentytwentyone is used by more websites in our catalog: 544 use bb-theme-child and 655 use twentytwentyone.

bb-theme-child sites have the higher median Ahrefs Domain Rating (bb-theme-child: 28, twentytwentyone: 18).

Between 2026-06 and 2026-07, bb-theme-child went from 0.06% to 0.06% of all tracked sites, while twentytwentyone went from 0.08% to 0.07%. bb-theme-child is gaining ground faster in our index.

No. A site runs a single WordPress theme, so bb-theme-child 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.