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 26,811

103,547

United Kingdom 1,472

40,783

Canada 3,324

33,265

Australia 758

30,331

Germany 532

26,133

France 532

23,908

India 1,648

22,437

Spain 473

16,738

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 Constant Contact sites · All Klaviyo sites