Shipvane · 4 AE roles
Marco E. · joined Cargolio
Fleetora · first roles in DECustomer.io VS Klaviyo_
As of 4 November 2026, Klaviyo is named by 803 companies and Customer.io by 232; Customer.io skews to companies under 200 people (66% vs 68%), Klaviyo to companies over 1,000 (11% 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, Klaviyo 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%
- Klaviyo: 2–200 employees
- 68%
- Customer.io: 1,000+ employees
- 6%
- Klaviyo: 1,000+ employees
- 11%
- Postings per company, 90 days
- 1.6 · 2.0
- Website or DNS footprint
- 4,525 · 120,884
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 | Klaviyo | share | Leans |
|---|---|---|---|---|---|
| Self-employed | 13 | 6% | 54 | 7% | even |
| 2-10 employees | 30 | 13% | 116 | 14% | even |
| 11-50 employees | 66 | 28% | 210 | 26% | Customer.io |
| 51-200 employees | 58 | 25% | 218 | 27% | Klaviyo |
| 201-500 employees | 34 | 15% | 79 | 10% | Customer.io |
| 501-1000 employees | 17 | 7% | 39 | 5% | Customer.io |
| 1001-5000 employees | 13 | 6% | 54 | 7% | even |
| 10,001+ employees | 1 | 0% | 18 | 2% | even |
| 5001-10000 employees | – | – | 15 | 2% | outside top 12 |
| Segment | Customer.io | share | Klaviyo | share | Leans |
|---|---|---|---|---|---|
| Technology & software | 113 | 49% | 123 | 15% | Customer.io |
| Business & finance services | 51 | 22% | 174 | 22% | even |
| Health care | 24 | 10% | 21 | 3% | Customer.io |
| Media & content | 13 | 6% | 50 | 6% | even |
| Commerce & trade | 10 | 4% | 214 | 27% | Klaviyo |
| Consumer services & leisure | 9 | 4% | 30 | 4% | even |
| Manufacturing & industry | 5 | 2% | 131 | 16% | Klaviyo |
| Property & construction | 3 | 1% | 9 | 1% | even |
| Hospitality & travel | 2 | 1% | 15 | 2% | even |
| Public, community & associations | 1 | 0% | 14 | 2% | even |
| Transport, logistics & rental | 1 | 0% | – | – | outside top 12 |
| Automotive | – | – | 13 | 2% | outside top 12 |
| Agriculture & forestry | – | – | 4 | 0% | outside top 12 |
| Segment | Customer.io | share | Klaviyo | share | Leans |
|---|---|---|---|---|---|
| United States | 148 | 64% | 444 | 55% | Customer.io |
| United Kingdom | 24 | 10% | 68 | 8% | even |
| France | 8 | 3% | 13 | 2% | even |
| Australia | 6 | 3% | 20 | 2% | even |
| Canada | 5 | 2% | 26 | 3% | even |
| Ukraine | 4 | 2% | – | – | outside top 12 |
| Switzerland | 3 | 1% | – | – | outside top 12 |
| Germany | 3 | 1% | 70 | 9% | Klaviyo |
| India | 3 | 1% | 16 | 2% | even |
| United Arab Emirates | 2 | 1% | – | – | outside top 12 |
| Brazil | 2 | 1% | – | – | outside top 12 |
| Netherlands | 2 | 1% | 21 | 3% | even |
| Denmark | – | – | 15 | 2% | outside top 12 |
| Belgium | – | – | 9 | 1% | outside top 12 |
| Austria | – | – | 7 | 1% | outside top 12 |
| Italy | – | – | 7 | 1% | outside top 12 |
| Segment | Customer.io | share | Klaviyo | share | Leans |
|---|---|---|---|---|---|
| Marketing & communications | 275 | 61% | 1,392 | 67% | Klaviyo |
| Product, program & project management | 32 | 7% | 41 | 2% | Customer.io |
| Sales | 31 | 7% | 80 | 4% | Customer.io |
| Software engineering | 19 | 4% | 68 | 3% | even |
| Customer service & success | 11 | 2% | 36 | 2% | even |
| Data & AI | 8 | 2% | 59 | 3% | even |
| Travel, leisure & events | 8 | 2% | 7 | 0% | even |
| General management & consulting | 4 | 1% | 10 | 0% | even |
| IT operations & business systems | 4 | 1% | 12 | 1% | even |
| Business development & strategy | 2 | 0% | 23 | 1% | even |
| Design & UX | 2 | 0% | 97 | 5% | Klaviyo |
| Engineering (non-software) | 1 | 0% | – | – | outside top 12 |
| facilities cleaning and security | 1 | 0% | – | – | outside top 12 |
| Finance & accounting | 1 | 0% | 3 | 0% | even |
| manufacturing and production | 1 | 0% | – | – | outside top 12 |
| Retail & store operations | 1 | 0% | 2 | 0% | even |
| Unclassified | – | – | 14 | 1% | outside top 12 |
| Administration & office | – | – | 8 | 0% | outside top 12 |
| arts media and entertainment | – | – | 3 | 0% | outside top 12 |
| hospitality and food service | – | – | 2 | 0% | outside top 12 |
| Education & training | – | – | 1 | 0% | outside top 12 |
| logistics warehouse and transport | – | – | 1 | 0% | outside top 12 |
| real estate and property | – | – | 1 | 0% | outside top 12 |
| social care and community | – | – | 1 | 0% | outside top 12 |
The companies behind each column
Companies using Customer.io →
Companies using Klaviyo →
customer engagement platforms ranked →
Quote the sentence with the date and the link. The numbers change daily; the link always shows the current ones.
Klaviyo is named by 803 companies in job postings and Customer.io by 232; 61 name both. (Breaknorm, 4 November 2026, https://breaknorm.co/compare/customer-io-vs-klaviyo)
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 Klaviyo: questions
Which is more used, Customer.io or Klaviyo?
By companies naming it in their own job postings, Klaviyo (803) over Customer.io (232). By website-and-DNS footprint, Klaviyo (120,884 vs 4,525), 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 68% for Klaviyo. 6% of Customer.io companies have over 1,000 employees, against 11% for Klaviyo.
Do companies run both?
61 companies name both in their postings, usually Customer.io in marketing and Klaviyo 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.
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