HTTP/3 vs Prism

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

Top sites by authority

HTTP/3 · Prism · 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 · Prism · share of sites in each country using one or the other

United States 1,284,004

24,601

India 592,975

18,002

United Kingdom 436,501

11,764

Brazil 418,679

10,044

Indonesia 328,375

9,251

Canada 321,328

10,220

Germany 316,957

12,114

Italy 305,727

8,574

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 HTTP/3 sites · All Prism sites