Caddy vs IIS

IIS is used by more websites in our catalog: 585 use Caddy and 14,679 use IIS.

IIS sites have the higher median Ahrefs Domain Rating (Caddy: 28, IIS: 35).

Between 2026-06 and 2026-07, Caddy went from 0.08% to 0.07% of all tracked sites, while IIS went from 1.8% to 1.7%. Caddy is gaining ground faster in our index.

8 websites in our catalog use both Caddy and IIS.

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.