Marketing automation
Who left Customer.io, and who still runs it
218 websites in the top 1M run Customer.io, observed directly from the rendered page in the July 2026 crawl.
53
stopped running it that month
9
of those are 11–500 employees
110
adopted it in the last year
Confirmed across two consecutive crawls, not a single month. Build the list →
Some companies running Customer.io
Every row in a full list carries the prospect's whole detected stack.
Not currently available as a list.
What else they run
Google Analytics 94%Cloudflare 85%Google Tag Manager 81%core-js 78%Open Graph 76%Facebook Pixel 60%Cloudflare Bot Management 59%Google Workspace 58%HSTS 56%React 56%
Share of a 218-domain sample of Customer.io users that also run each.