Advanced Custom Fields vs RankMath SEO

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

Top sites by authority

Advanced Custom Fields · RankMath SEO · 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

Advanced Custom Fields · RankMath SEO · share of sites in each country using one or the other

United States 1,959

112,652

India 491

69,474

Germany 567

49,126

United Kingdom 766

38,904

Spain 414

36,292

France 994

34,405

Brazil 337

33,148

Italy 381

31,059

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 Advanced Custom Fields sites · All RankMath SEO sites