Websites Powered by Customer.io

3,141 websites tracked using Customer.io (Marketing automation) · customer.io

Customer.io is a marketing automation platform for campaigns and lead nurturing. Its official site is customer.io. PoweredBy tracks the websites that use Customer.io across the public web; the tracked counts, adoption trend, and site list on this page are updated from our ongoing crawl of the marketing automation ecosystem.

Usage trend

Core Web Vitals

Median site among 1,470 Customer.io sites with Chrome UX data, p75 values, Jun 2026.

Top countries

United States 1,038

India 649

Canada 553

United Kingdom 545

Germany 508

Australia 443

France 439

Spain 384

Sites using Customer.io by audience country, Chrome UX Report.

Top sites by authority

The share of the web's most authoritative domains, by Open Page Rank tier, seen running Customer.io in recent crawls. Only 372 domains worldwide score 9 or higher.

Websites using Customer.io

Open Page Rank is the domain's authority score (0 to 10, from the open web link graph); the list is ordered by it and covers sites seen in recent crawls. Visits and keywords are estimated US organic search figures.

Download top 10,000 as CSV (zip) →

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