Bootstrap vs W3.CSS

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

Top sites by authority

Bootstrap · W3.CSS · 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

Bootstrap · W3.CSS · share of sites in each country using one or the other

United States 758,929

2,024

India 368,409

2,142

Germany 277,428

860

United Kingdom 255,833

868

Brazil 241,343

872

France 234,434

800

Italy 222,549

709

Spain 183,194

658

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 Bootstrap sites · All W3.CSS sites