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 849,474

171,809

Germany 314,354

62,310

India 299,510

75,536

Italy 282,524

58,817

United Kingdom 269,921

65,350

France 271,447

54,908

Japan 282,542

26,777

Spain 252,481

55,403

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 Migrate sites · All Underscore.js sites