HSTS vs Really Simple SSL & Security

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

Top sites by authority

HSTS · Really Simple SSL & Security · 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

HSTS · Really Simple SSL & Security · share of sites in each country using one or the other

United States 1,348,640

83,739

United Kingdom 403,486

29,953

Germany 403,347

28,990

India 400,388

25,526

France 317,870

32,992

Brazil 290,538

43,852

Canada 289,821

19,306

Italy 219,709

30,741

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 HSTS sites · All Really Simple SSL & Security sites