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 1,137,483

22,553

India 533,896

15,694

Brazil 409,200

8,927

United Kingdom 387,999

10,349

Indonesia 291,484

7,982

Germany 286,932

10,480

Italy 284,574

7,628

Canada 281,458

9,083

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 HTTP/3 sites · All Prism sites