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 1,338,613

80,589

United Kingdom 411,483

29,199

India 404,554

24,405

Germany 400,616

27,743

France 326,363

33,645

Brazil 292,843

41,568

Canada 290,713

18,933

Spain 221,261

43,010

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 HSTS sites · All Really Simple SSL & Security sites