jQuery UI vs Underscore.js

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

Top sites by authority

jQuery UI · Underscore.js · 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

jQuery UI · Underscore.js · share of sites in each country using one or the other

United States 661,346

196,685

India 293,145

88,983

Germany 277,600

71,501

France 251,984

65,402

United Kingdom 231,762

74,584

Italy 225,771

65,347

Brazil 228,647

48,901

Spain 209,058

60,653

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 jQuery UI sites · All Underscore.js sites