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 886,770

147

India 429,293

208

Germany 322,762

69

United Kingdom 295,976

70

France 279,130

62

Brazil 273,285

52

Italy 251,088

41

Spain 202,979

32

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 Bootstrap sites · All Preline UI sites