Alexa Certified Site Metrics vs Site Kit

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

Top sites by authority

Alexa Certified Site Metrics · 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

Alexa Certified Site Metrics · Site Kit · share of sites in each country using one or the other

United States 2,381

215,676

India 1,482

110,602

Japan 783

82,773

Brazil 738

80,295

France 1,195

74,632

United Kingdom 1,340

72,179

Spain 923

67,753

Italy 962

63,679

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 Alexa Certified Site Metrics sites · All Site Kit sites