IIS vs Phusion Passenger

Head-to-head usage across the sites we track.

Top sites by authority

IIS · Phusion Passenger · how many of each technology's sites sit in the web's highest authority tiers

Open Page Rank scores 0 to 10 from the open web link graph; 9+ covers only a few hundred domains worldwide.

By country

IIS · Phusion Passenger · share of sites in each country using one or the other

United States 117,730

9,471

India 58,829

3,383

United Kingdom 42,820

2,795

Italy 40,808

2,005

Brazil 34,656

2,080

Canada 31,601

2,743

Germany 31,200

2,649

Türkiye 31,246

1,263

Audience countries from the Chrome UX Report, top markets of either technology.

Real user performance

Median site's p75 values from the Chrome UX Report, Sep 2026. Lower is better; green meets Google's "good" threshold. This describes the sites that use each technology, not the technology's own overhead.

Sites that switched

Domains that dropped one technology and adopted the other within about a year, data nobody else gives away free.

All IIS sites · All Phusion Passenger sites