IIS vs Phusion Passenger

IIS is used by more websites in our catalog: 14,679 use IIS and 943 use Phusion Passenger.

IIS sites have the higher median Ahrefs Domain Rating (IIS: 35, Phusion Passenger: 32).

Between 2026-06 and 2026-07, IIS went from 1.8% to 1.7% of all tracked sites, while Phusion Passenger went from 0.12% to 0.11%. Phusion Passenger is gaining ground faster in our index.

0 websites in our catalog use both IIS and Phusion Passenger.

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.