birch-trellis vs h4

h4 is used by more websites in our catalog: 119 use birch-trellis and 666 use h4.

birch-trellis sites have the higher median Ahrefs Domain Rating (birch-trellis: 24, h4: 8).

Between 2026-06 and 2026-07, birch-trellis went from 0.02% to 0.01% 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 birch-trellis 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.