Site Kit vs VWO

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

Top sites by authority

Site Kit · VWO · 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

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

United States 194,442

17,086

India 96,669

8,231

Brazil 73,670

4,979

Japan 73,684

3,278

United Kingdom 63,934

8,597

France 62,421

5,367

Spain 58,678

5,229

Italy 55,218

4,532

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 Site Kit sites · All VWO sites