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 89,280

1,479,835

India 59,977

495,926

United Kingdom 37,571

457,421

Germany 34,536

439,161

Brazil 22,573

420,075

France 33,083

369,824

Canada 24,788

341,001

Italy 24,311

336,371

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 AOS sites · All core-js sites