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 1,894

886,770

India 339

429,293

Germany 874

322,762

United Kingdom 790

295,976

France 302

279,130

Brazil 155

273,285

Italy 327

251,088

Spain 232

202,979

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, Jun 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