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 571,404

171,809

India 248,863

75,536

Germany 241,117

62,310

France 214,196

54,908

United Kingdom 200,445

65,350

Italy 201,839

58,817

Spain 191,362

55,403

Brazil 201,788

42,848

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 jQuery UI sites · All Underscore.js sites