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 9,592

121,069

India 4,929

60,068

United Kingdom 4,096

43,214

Italy 2,685

39,691

Brazil 3,353

35,276

Germany 4,338

31,791

Canada 3,141

31,780

Türkiye 1,603

31,323

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, Aug 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