ClientJS vs core-js

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

Top sites by authority

ClientJS · core-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

ClientJS · core-js · share of sites in each country using one or the other

United States 980

1,320,418

India 652

439,882

Brazil 668

411,231

United Kingdom 642

404,005

Germany 713

391,462

France 575

311,727

Canada 488

298,167

Italy 553

291,018

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 ClientJS sites · All core-js sites