twentytwentyone vs understrap-child

twentytwentyone is used by more websites in our catalog: 655 use twentytwentyone and 206 use understrap-child.

understrap-child sites have the higher median Ahrefs Domain Rating (twentytwentyone: 18, understrap-child: 33).

Between 2026-06 and 2026-07, twentytwentyone went from 0.08% to 0.07% of all tracked sites, while understrap-child went from 0.03% to 0.02%. understrap-child is gaining ground faster in our index.

No. A site runs a single WordPress theme, so twentytwentyone and understrap-child 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.