AOS vs core-js

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

Top sites by authority

AOS · 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

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

United States 79,472

1,320,418

India 53,006

439,882

United Kingdom 32,455

404,005

Brazil 20,718

411,231

Germany 30,862

391,462

France 28,155

311,727

Canada 21,619

298,167

Italy 21,187

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 AOS sites · All core-js sites