IIS vs Tengine

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

Top sites by authority

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

United States 136,825

4,100

India 68,343

1,871

United Kingdom 49,161

1,407

Italy 46,831

1,053

Brazil 38,951

2,413

Germany 36,200

1,513

Canada 36,284

1,377

Türkiye 36,724

861

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 Tengine sites