Automatic.css vs Bootstrap

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

Top sites by authority

Automatic.css · Bootstrap · 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

Automatic.css · Bootstrap · share of sites in each country using one or the other

United States 1,725

783,149

India 303

375,468

Germany 820

285,193

United Kingdom 714

258,945

Brazil 112

247,896

France 243

233,698

Italy 291

215,264

Canada 399

174,973

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 Automatic.css sites · All Bootstrap sites