Bootstrap vs Preline UI

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

Top sites by authority

Bootstrap · Preline UI · 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 · Preline UI · share of sites in each country using one or the other

United States 783,149

124

India 375,468

174

Germany 285,193

56

United Kingdom 258,945

62

Brazil 247,896

49

France 233,698

48

Italy 215,264

35

Canada 174,973

45

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 Bootstrap sites · All Preline UI sites