customizr vs h4

h4 is used by more websites in our catalog: 164 use customizr and 666 use h4.

customizr sites have the higher median Ahrefs Domain Rating (customizr: 15, h4: 8).

Between 2026-06 and 2026-07, customizr went from 0.02% to 0.02% of all tracked sites, while h4 went from 0.07% to 0.08%. h4 is gaining ground faster in our index.

No. A site runs a single WordPress theme, so customizr and h4 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.