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Sites using Customer.io

70 launches via launch platforms Category: Email Marketing #8 of 91 in Email Marketing Tracked since Apr 2026 Last seen: Jul 18, 2026 Website: customer.io

Customer.io marketing automation and transactional email.

Found via: Product Hunt 61 · Hacker News 8 · PeerPush 1 · StackScope Discovery (Indie) 1 · StackScope Wider Web 16

View: Launch platforms All sources StackScope Discovery StackScope Wider Web
Last 7 days 0.2% +0.0pp
Most used with Google Tag Manager, HSTS, Google Analytics
Top product types AI, Marketing, Productivity
Green hosting 18% vs 44% avg

Customer.io has been detected on 70 launches we've crawled, with 18 of those in July 2026 (0.2% of the month's launches so far). The 7-day rolling share is 0.2%, roughly steady week on week. Most recent detection: Startup Idea Canvas (Notion Template), today.

It's most commonly paired with Google Tag Manager, HSTS, and Google Analytics. By product type, the launches using it are most often AI (21%), Marketing (17%), and Productivity (17%). By estimated origin, South Korea leads (49%), ahead of the United States (30%). By domain ending, launches using it are 1.6 times as likely as the average launch to live on a .com domain. The 70 scored launches using Customer.io average a StackScope score of 7.3 out of 10, against 6.3 across all launches we score.

What kind of products ship with Customer.io

53 launches

AI
20.75%
Marketing
16.98%
Productivity
16.98%
Developer Tools
15.09%
Finance
13.21%
Health
7.55%
Education
3.77%
Content
1.89%
Design
1.89%
Social
1.89%

Countries that use Customer.io

Estimated origin for 43 of 70 launches

  • South Korea South Korea 48.84%
  • United States United States 30.23%
  • Italy Italy 6.98%
  • Australia Australia 2.33%
  • Brazil Brazil 2.33%
  • Canada Canada 2.33%
  • United Kingdom United Kingdom 2.33%
  • Netherlands Netherlands 2.33%
  • Thailand Thailand 2.33%

Share of new launches using Customer.io

Each dot is one launch day. Line is the 7-day rolling average.

0.2%
last 7 days
+0.0pp vs prior week
0.2%
July so far
18 of 10,669 launches
70
launches all time
since Apr 2026
Customer.io daily detection trend 5% 2% 0% May Jun Jul Apr 22, 2026: Improved detection coverage for this technology. Apr 19 · 0 / 392 = 0.0% Apr 20 · 0 / 620 = 0.0% Apr 21 · 1 / 835 = 0.1% Apr 22 · 0 / 721 = 0.0% Apr 23 · 2 / 603 = 0.3% Apr 24 · 0 / 553 = 0.0% Apr 25 · 0 / 420 = 0.0% Apr 26 · 0 / 377 = 0.0% Apr 27 · 2 / 529 = 0.4% Apr 28 · 1 / 836 = 0.1% Apr 29 · 0 / 658 = 0.0% Apr 30 · 3 / 573 = 0.5% May 1 · 1 / 568 = 0.2% May 2 · 0 / 368 = 0.0% May 3 · 0 / 346 = 0.0% May 4 · 0 / 536 = 0.0% May 5 · 0 / 855 = 0.0% May 6 · 2 / 671 = 0.3% May 7 · 1 / 624 = 0.2% May 8 · 0 / 597 = 0.0% May 9 · 0 / 428 = 0.0% May 10 · 1 / 350 = 0.3% May 11 · 1 / 536 = 0.2% May 12 · 1 / 797 = 0.1% May 13 · 1 / 687 = 0.1% May 14 · 0 / 625 = 0.0% May 15 · 0 / 542 = 0.0% May 16 · 0 / 407 = 0.0% May 17 · 1 / 367 = 0.3% May 18 · 0 / 566 = 0.0% May 19 · 0 / 846 = 0.0% May 20 · 1 / 674 = 0.1% May 21 · 1 / 606 = 0.2% May 22 · 1 / 546 = 0.2% May 23 · 0 / 378 = 0.0% May 24 · 0 / 341 = 0.0% May 25 · 0 / 535 = 0.0% May 26 · 0 / 877 = 0.0% May 27 · 1 / 683 = 0.1% May 28 · 0 / 577 = 0.0% May 29 · 1 / 486 = 0.2% May 30 · 0 / 377 = 0.0% May 31 · 0 / 368 = 0.0% Jun 1 · 0 / 619 = 0.0% Jun 2 · 0 / 927 = 0.0% Jun 3 · 0 / 711 = 0.0% Jun 4 · 0 / 598 = 0.0% Jun 5 · 0 / 578 = 0.0% Jun 6 · 2 / 436 = 0.5% Jun 7 · 0 / 405 = 0.0% Jun 8 · 0 / 511 = 0.0% Jun 9 · 0 / 872 = 0.0% Jun 10 · 0 / 725 = 0.0% Jun 11 · 1 / 573 = 0.2% Jun 12 · 0 / 445 = 0.0% Jun 13 · 0 / 381 = 0.0% Jun 14 · 0 / 346 = 0.0% Jun 15 · 0 / 530 = 0.0% Jun 16 · 1 / 1047 = 0.1% Jun 17 · 1 / 899 = 0.1% Jun 18 · 1 / 672 = 0.1% Jun 19 · 1 / 544 = 0.2% Jun 20 · 0 / 443 = 0.0% Jun 21 · 0 / 384 = 0.0% Jun 22 · 1 / 574 = 0.2% Jun 23 · 1 / 899 = 0.1% Jun 24 · 2 / 739 = 0.3% Jun 25 · 0 / 619 = 0.0% Jun 26 · 3 / 533 = 0.6% Jun 27 · 0 / 433 = 0.0% Jun 28 · 0 / 385 = 0.0% Jun 29 · 1 / 503 = 0.2% Jun 30 · 0 / 803 = 0.0% Jul 1 · 1 / 799 = 0.1% Jul 2 · 0 / 604 = 0.0% Jul 3 · 0 / 498 = 0.0% Jul 4 · 0 / 411 = 0.0% Jul 5 · 0 / 367 = 0.0% Jul 6 · 0 / 552 = 0.0% Jul 7 · 2 / 929 = 0.2% Jul 8 · 3 / 752 = 0.4% Jul 9 · 2 / 690 = 0.3% Jul 10 · 1 / 566 = 0.2% Jul 11 · 0 / 450 = 0.0% Jul 12 · 1 / 397 = 0.3% Jul 13 · 0 / 553 = 0.0% Jul 14 · 2 / 885 = 0.2% Jul 15 · 4 / 738 = 0.5% Jul 16 · 2 / 820 = 0.2% Jul 17 · 0 / 658 = 0.0%
Apr 19, 2026 90 days Jul 17, 2026

How StackScope detects technologies

⋮ Apr 22, 2026: Improved detection coverage for this technology.

Email Marketing leaders

Tool % of launches % of category
#1 – Brevo 3.47% 51.55%
#2 – HubSpot 1.35% 20.04%
#3 – MailerLite 0.68% 10.05%
#4 – Mailchimp 0.51% 7.53%
#5 ▲1 Zoho Campaigns 0.24% 3.58%
…
#8 – Customer.io Current page 0.11% 1.64%

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 Mailchimp. All 91 in Email Marketing →

Often used with

Tool Launches
Google Tag Manager 63
HSTS 60
Google Analytics 59
Google Search Console 53
Cloudflare 46

Tools most often detected on the same launches as Customer.io.

Highest-scoring launches using Customer.io

The top launches by StackScope score among the 70 we've detected using Customer.io.

Screenshot of Coworker AI, a launch using Customer.io Coworker AI May 27, 2026 · score 10.0 United States AI Screenshot of Universal-3.5 Pro, a launch using Customer.io Universal-3.5 Pro Jul 8, 2026 · score 9.5 United States Developer Tools Screenshot of Doola, a launch using Customer.io Doola Jun 24, 2026 · score 9.5 United States Finance Screenshot of Nimbalyst, a launch using Customer.io Nimbalyst Apr 30, 2026 · score 9.5 AI Screenshot of ChīpuChīpu: Travel Japanese, a launch using Customer.io ChīpuChīpu: Travel Japanese Jun 26, 2026 · score 9.2 South Korea Education Screenshot of HeyMax, a launch using Customer.io HeyMax May 11, 2026 · score 9.2 Finance

Most recent of 70 launches using Customer.io

Screenshot of Startup Idea Canvas (Notion Template), a launch using Customer.io Startup Idea Canvas (Notion Template) Jul 18, 2026 · score 7.8 South Korea Productivity Screenshot of Freelancer OS, a launch using Customer.io Freelancer OS Jul 16, 2026 · score 7.0 South Korea Productivity Screenshot of Kalendar, a launch using Customer.io Kalendar Jul 16, 2026 · score 3.3 Screenshot of Change-Stack.com - Change opportunites, a launch using Customer.io Change-Stack.com - Change opportunites Jul 15, 2026 · score 7.0 South Korea Screenshot of New AI tools by IFTTT, a launch using Customer.io New AI tools by IFTTT Jul 15, 2026 · score 8.5 United States AI Screenshot of MentalHappy 3.0, a launch using Customer.io MentalHappy 3.0 Jul 15, 2026 · score 7.6 United States Social Screenshot of Birdie, a launch using Customer.io Birdie Jul 15, 2026 · score 7.6 Australia Marketing Screenshot of AI Builder Week by Product School, a launch using Customer.io AI Builder Week by Product School Jul 14, 2026 · score 7.5 AI Screenshot of AI Personal Growth OS , a launch using Customer.io AI Personal Growth OS Jul 14, 2026 · score 7.6 Health Screenshot of ClientFlow AI – Freelancer Dashboard, a launch using Customer.io ClientFlow AI – Freelancer Dashboard Jul 12, 2026 · score 7.0 South Korea Screenshot of Transitcompare, a launch using Customer.io Transitcompare Jul 10, 2026 · score 3.8 Screenshot of Dumbo Health, a launch using Customer.io Dumbo Health Jul 9, 2026 · score 6.9 Health

Showing the most recent 12 of 70.

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