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 988,550

196,685

India 354,719

88,983

Germany 361,975

71,501

United Kingdom 313,223

74,584

France 322,388

65,402

Italy 315,256

65,347

Japan 329,383

31,250

Spain 276,437

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 Migrate sites · All Underscore.js sites