Caddy vs IIS

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

Top sites by authority

Caddy · IIS · 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

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

United States 10,865

136,825

India 5,533

68,343

United Kingdom 4,511

49,161

Italy 3,013

46,831

Brazil 3,684

38,951

Germany 4,904

36,200

Canada 3,629

36,284

Türkiye 1,828

36,724

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 Caddy sites · All IIS sites