Fathom vs Site Kit

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

Top sites by authority

Fathom · Site Kit · 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

Fathom · Site Kit · share of sites in each country using one or the other

United States 5,103

194,442

India 1,853

96,669

Brazil 955

73,670

Japan 608

73,684

United Kingdom 3,143

63,934

France 1,314

62,421

Spain 1,042

58,678

Italy 1,048

55,218

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 Fathom sites · All Site Kit sites