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 585,514

174,846

India 254,733

77,587

Germany 246,243

63,127

United Kingdom 201,723

65,581

France 210,785

54,266

Brazil 208,190

43,920

Italy 195,443

56,155

Spain 180,678

51,985

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 jQuery UI sites · All Underscore.js sites