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 8,992

117,730

India 5,042

58,829

United Kingdom 4,098

42,820

Italy 2,804

40,808

Brazil 3,343

34,656

Germany 4,197

31,200

Canada 3,166

31,601

Türkiye 1,623

31,246

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 Caddy sites · All IIS sites