Constant Contact vs Klaviyo

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

Top sites by authority

Constant Contact · Klaviyo · 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

Constant Contact · Klaviyo · share of sites in each country using one or the other

United States 23,768

94,562

United Kingdom 1,265

37,244

Canada 2,891

29,978

Australia 693

27,541

Germany 445

24,145

France 390

21,230

India 1,474

20,024

Spain 362

16,028

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 Constant Contact sites · All Klaviyo sites