HTTP/3 vs SWC

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

Top sites by authority

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

United States 1,137,483

14,379

India 533,896

5,071

Brazil 409,200

3,552

United Kingdom 387,999

6,077

Indonesia 291,484

2,123

Germany 286,932

4,412

Canada 281,458

6,224

Italy 284,574

2,770

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 SWC sites