jQuery Migrate vs Underscore.js

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

Top sites by authority

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

United States 873,360

174,846

India 307,283

77,587

Germany 320,699

63,127

United Kingdom 271,907

65,581

Italy 269,098

56,155

France 267,883

54,266

Japan 283,792

26,796

Brazil 256,253

43,920

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 Migrate sites · All Underscore.js sites