Sites using Customer.io
Customer.io marketing automation and transactional email.
Get told when a new site ships with Customer.io.
Stackdar watches every launch we detect and sends you the ones using Customer.io, by email, Slack or webhook. On every plan, from £15 a month.
See how alerts work564 sites
469 found by StackScope, 95 via launch platforms
- StackScope Wider Web 424
- StackScope Discovery (Indie) 45
- Product Hunt 80
- Hacker News 11
- PeerPush 3
- Other 1
Customer.io has been detected on 564 launches we've crawled. The 7-day rolling share is 0.0%, roughly steady week on week. Most recent detection: Gem-manatee-cd0, today.
It's most commonly paired with Google Tag Manager, Google Analytics, and HSTS. By product type, the launches using it are most often Productivity (15%), E-commerce (13%), and Marketing (11%). By domain ending, launches using it are 9.2 times as likely as the average launch to live on a .site domain. The 93 scored launches using Customer.io average a StackScope score of 7.5 out of 10, against 6.4 across all launches we score.
What kind of products ship with Customer.io
183 launches
Domain endings using Customer.io
561 sites
- .com 45.28%
- .site 14.26%
- .ca 5.17%
- .store 4.10%
- .io 3.57%
- .co 3.21%
- .ai 3.03%
- .app 2.67%
- .xyz 2.32%
- .org 1.78%
- .so 1.60%
- .dev 1.25%
- .online 1.07%
- .ink 0.89%
Country
20 of 564 sites, where we are confident of the country.
-
United States
75.00%
-
India
15.00%
-
Australia
5.00%
-
Canada
5.00%
Share of new sites using Customer.io
Each dot is one launch day. Line is the 7-day rolling average; weekly averages before June 2026.
The shaded part of the chart is measured against a different set of sites. Until 8 July 2026 we only tracked launches from launch platforms; from that date we crawl the wider web as well. The share is a proportion of whatever we were tracking at the time, so it can step at that line without the technology itself changing. For a single continuous measure, switch to launch platforms.
Email Marketing leaders
| Tool | % of launches | % of category | ||
|---|---|---|---|---|
| #1 | – |
Brevo
|
0.96% | 48.56% |
| #2 | ▲1 |
Klaviyo
|
0.28% | 14.02% |
| #3 | ▼2 |
HubSpot
|
0.18% | 9.05% |
| #4 | ▲1 |
Mailchimp
|
0.17% | 8.81% |
| #5 | – |
MailerLite
|
0.15% | 7.43% |
| … | ||||
| #11 | ▼1 |
Customer.io
Current page
|
0.02% | 1.13% |
Percentages show adoption among indie launches: the share of all analysed launches, and of launches using any Email Marketing tool.The most common alternatives to Customer.io among indie launches are Brevo and Klaviyo. All 213 in Email Marketing →
Often used with
| Tool | Launches |
|---|---|
Google Tag Manager
|
84 |
Google Analytics
|
78 |
| HSTS | 78 |
Google Search Console
|
70 |
Cloudflare
|
64 |
Tools most often detected on the same launches as Customer.io.
Recent launches we can show
140 of the 564 sites using Customer.io are product launches we list individually. The other 424 are sites we found crawling the wider web: they count towards the figures above, but we do not publish them one by one. How StackScope Discovery works
Gem-manatee-cd0
Health
ClearCost Korea
Health
Neighborrow
Social
MyStayroute — AI Concierge for Airbnb Hosts, Hotels & Glamping Sites
Kfyran: din K4 för CFD och valuta, klar
Finance
만선비서 | 조업부터 장부까지
Productivity
Firecrawl Developer Index
Developer Tools
돌봄길 — 부모님께 맞는 돌봄 찾기
Sparrow-2
Kitewing
Marketing
Melray — Tu inventario. Sin el caos.
PATCH//HAVEN — Every Death Builds the World
Showing the most recent 12 of 140.
The StackScope API serves all 564 sites using Customer.io, filterable and exportable, from £15 a month.