astra-child vs kallyas

astra-child is used by more websites in our catalog: 649 use astra-child and 155 use kallyas.

astra-child sites have the higher median Ahrefs Domain Rating (astra-child: 26, kallyas: 18).

Between 2026-06 and 2026-07, astra-child went from 0.09% to 0.07% of all tracked sites, while kallyas went from 0.02% to 0.02%. kallyas is gaining ground faster in our index.

No. A site runs a single WordPress theme, so astra-child and kallyas 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.