Boomerang vs core-js

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

Top sites by authority

Boomerang · 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

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

United States 37,107

1,320,418

India 15,494

439,882

United Kingdom 15,892

404,005

Brazil 7,006

411,231

Germany 12,231

391,462

France 10,692

311,727

Canada 14,361

298,167

Italy 9,071

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 Boomerang sites · All core-js sites