AppNexus vs OpenX

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

Top sites by authority

AppNexus · OpenX · 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

AppNexus · OpenX · share of sites in each country using one or the other

United States 55,306

40,202

United Kingdom 25,318

20,766

Canada 24,555

20,948

India 18,466

14,264

Germany 18,026

13,671

Australia 16,016

13,982

France 17,057

11,940

Spain 15,020

10,918

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 AppNexus sites · All OpenX sites