Customer.io VS Iterable
As of 4 November 2026, Iterable is named by 322 companies and Customer.io by 232; Customer.io skews to companies under 200 people (66% vs 44%), Iterable to companies over 1,000 (23% vs 6%).
As of 4 November 2026 · refreshed daily · counts move as websites, DNS and career sites are re-read.
The website-and-DNS footprint is not comparable between a marketing suite and a CRM: Customer.io's script and mail records show on hundreds of thousands of small sites, Iterable rarely leaves a trace outside its own apps. Compare on the job-posting numbers; use the footprint for reach.
- Customer.io: 2–200 employees
- 66%
- Iterable: 2–200 employees
- 44%
- Customer.io: 1,000+ employees
- 6%
- Iterable: 1,000+ employees
- 23%
- Postings per company, 90 days
- 1.6 · 1.6
- Website or DNS footprint
- 4,525 · 776
Who chooses which
Share of each tool's companies in every segment. "Leans" marks a gap of more than two points.
| Segment | Customer.io | share | Iterable | share | Leans |
|---|---|---|---|---|---|
| Self-employed | 13 | 6% | 10 | 3% | Customer.io |
| 2-10 employees | 30 | 13% | 15 | 5% | Customer.io |
| 11-50 employees | 66 | 28% | 52 | 16% | Customer.io |
| 51-200 employees | 58 | 25% | 75 | 23% | even |
| 201-500 employees | 34 | 15% | 58 | 18% | Iterable |
| 501-1000 employees | 17 | 7% | 39 | 12% | Iterable |
| 1001-5000 employees | 13 | 6% | 55 | 17% | Iterable |
| 10,001+ employees | 1 | 0% | 12 | 4% | Iterable |
| 5001-10000 employees | – | – | 6 | 2% | outside top 12 |
| Segment | Customer.io | share | Iterable | share | Leans |
|---|---|---|---|---|---|
| Technology & software | 113 | 49% | 91 | 28% | Customer.io |
| Business & finance services | 51 | 22% | 75 | 23% | even |
| Health care | 24 | 10% | 27 | 8% | even |
| Media & content | 13 | 6% | 29 | 9% | Iterable |
| Commerce & trade | 10 | 4% | 28 | 9% | Iterable |
| Consumer services & leisure | 9 | 4% | 13 | 4% | even |
| Manufacturing & industry | 5 | 2% | 20 | 6% | Iterable |
| Property & construction | 3 | 1% | 8 | 2% | even |
| Hospitality & travel | 2 | 1% | 16 | 5% | Iterable |
| Public, community & associations | 1 | 0% | 7 | 2% | even |
| Transport, logistics & rental | 1 | 0% | – | – | outside top 12 |
| Automotive | – | – | 4 | 1% | outside top 12 |
| Utilities & infrastructure | – | – | 2 | 1% | outside top 12 |
| Segment | Customer.io | share | Iterable | share | Leans |
|---|---|---|---|---|---|
| United States | 148 | 64% | 222 | 69% | Iterable |
| United Kingdom | 24 | 10% | 28 | 9% | even |
| France | 8 | 3% | 4 | 1% | Customer.io |
| Australia | 6 | 3% | 4 | 1% | even |
| Canada | 5 | 2% | 10 | 3% | even |
| Ukraine | 4 | 2% | 3 | 1% | even |
| Switzerland | 3 | 1% | 3 | 1% | even |
| Germany | 3 | 1% | 7 | 2% | even |
| India | 3 | 1% | 2 | 1% | even |
| United Arab Emirates | 2 | 1% | – | – | outside top 12 |
| Brazil | 2 | 1% | – | – | outside top 12 |
| Netherlands | 2 | 1% | – | – | outside top 12 |
| CL | – | – | 2 | 1% | outside top 12 |
| Mexico | – | – | 2 | 1% | outside top 12 |
| MY | – | – | 2 | 1% | outside top 12 |
| Segment | Customer.io | share | Iterable | share | Leans |
|---|---|---|---|---|---|
| Marketing & communications | 275 | 61% | 383 | 64% | Iterable |
| Product, program & project management | 32 | 7% | 37 | 6% | even |
| Sales | 31 | 7% | 14 | 2% | Customer.io |
| Software engineering | 19 | 4% | 25 | 4% | even |
| Customer service & success | 11 | 2% | 10 | 2% | even |
| Data & AI | 8 | 2% | 14 | 2% | even |
| Travel, leisure & events | 8 | 2% | 1 | 0% | even |
| General management & consulting | 4 | 1% | 1 | 0% | even |
| IT operations & business systems | 4 | 1% | 8 | 1% | even |
| Business development & strategy | 2 | 0% | – | – | outside top 12 |
| Design & UX | 2 | 0% | 4 | 1% | even |
| Engineering (non-software) | 1 | 0% | 1 | 0% | even |
| Facilities cleaning and security | 1 | 0% | – | – | outside top 12 |
| Finance & accounting | 1 | 0% | 2 | 0% | even |
| Manufacturing and production | 1 | 0% | 1 | 0% | even |
| Retail & store operations | 1 | 0% | – | – | outside top 12 |
The companies behind each column
Companies using Customer.io →
Companies using Iterable →
customer engagement platforms ranked →
Quote the sentence with the date and the link. The numbers change daily; the link always shows the current ones.
Iterable is named by 322 companies in job postings and Customer.io by 232; 103 name both. (Breaknorm, 4 November 2026, https://breaknorm.co/compare/customer-io-vs-iterable)
Read from the source, not self-reported
Every number on this page can be traced to a page we crawled or a posting we read. Full methodology →
- Job postingsRead hourly from career sites. A tool counts when the employer's own text names it as the team's system; both tools can count for one company.
- Website and DNSScripts and embeds on the company's pages, plus SPF, DKIM, MX and CNAME records of its domain that point at the vendor.
- SegmentsCountry, size and industry from the company profile built from its website.
- Not a reviewNo ratings, prices or feature claims. For those, read the vendors.
Customer.io vs Iterable: questions
Which is more used, Customer.io or Iterable?
By companies naming it in their own job postings, Iterable (322) over Customer.io (232). By website-and-DNS footprint, Customer.io (4,525 vs 776), because its scripts and mail records sit on many small company sites.
Who chooses Customer.io?
66% of Customer.io companies have 2 to 200 employees, against 44% for Iterable. 6% of Customer.io companies have over 1,000 employees, against 23% for Iterable.
Do companies run both?
103 companies name both in their postings, usually Customer.io in marketing and Iterable in sales, or during a migration.
Where do these numbers come from?
From the employer's own text in job postings read hourly from career sites, and from scripts found on company websites in our crawl. No vendor data, no surveys.
Get either list your way
The same data as a search, over MCP and the API, as bulk files, or pushed to you as it changes.
Every company on either tool,
with the person who owns it
Filter on Customer.io or Iterable. Start free, no card.