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 191,744

17,274

India 94,995

8,269

Japan 73,790

3,354

Brazil 71,181

4,964

United Kingdom 64,452

8,797

France 63,629

5,428

Spain 63,132

5,544

Italy 58,351

4,756

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, Sep 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