comScore vs Site Kit

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

Top sites by authority

comScore · 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

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

United States 41,305

215,676

India 14,086

110,602

United Kingdom 19,595

72,179

Japan 5,638

82,773

Brazil 8,106

80,295

France 10,652

74,632

Spain 9,342

67,753

Italy 8,427

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 comScore sites · All Site Kit sites