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 1,657

758,929

India 283

368,409

Germany 842

277,428

United Kingdom 694

255,833

Brazil 102

241,343

France 251

234,434

Italy 305

222,549

Spain 209

183,194

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 Automatic.css sites · All Bootstrap sites