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 136,825

10,916

India 68,343

3,869

United Kingdom 49,161

3,214

Italy 46,831

2,290

Brazil 38,951

2,378

Canada 36,284

3,165

Germany 36,200

3,118

Türkiye 36,724

1,399

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, Jun 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