HTTP/3 vs Klaviyo Customer Hub

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

Top sites by authority

HTTP/3 · Klaviyo Customer Hub · 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

HTTP/3 · Klaviyo Customer Hub · share of sites in each country using one or the other

United States 1,141,651

7,801

India 531,962

1,954

Brazil 414,021

492

United Kingdom 386,042

3,174

Indonesia 294,061

430

Germany 289,537

1,597

Canada 280,974

2,780

Italy 273,070

1,045

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 HTTP/3 sites · All Klaviyo Customer Hub sites