A breakdown of the 5.6K+ companies running Customer.io.
Top industries
Information technology and services1.7K+
Professional and business services691
Financial services592
Education and training359
Health and wellness299
Art, sports and recreation294
Media and telecommunications246
Transport173
No industry recorded: 546
Company size
1–101,239 (29%)
11–501,303 (31%)
51–2501,029 (24%)
251–500298 (7%)
501–1,000155 (4%)
1,001–5,000188 (4%)
5,001–10,00026 (1%)
10,001+32 (1%)
Share of companies with a recorded size, by employees.
No size recorded: 1.3K+
One dataset. Four ways to sell.
Match the deepest technology intelligence against the most comprehensive data on companies and people – such as who is growing, raised capital or changed role – for pinpoint precision on GTM campaigns.
Competitor displacement
Find the accounts running a competitor today and go after them with the right argument.
Complementary tools
Target companies whose stack sits alongside yours and integrates without a fight.
Service partners
Identify implementers and agencies already working in the technologies you support.
Market insights
Map your total addressable market and track aggregated trends such as AI maturity.
Frequently asked questions
About the Customer.io data on this page.
How many companies use Customer.io?
Firmable holds confirmed Customer.io detections for 5,651 distinct companies, 3,648 of them confirmed in the last 90 days. A company is counted once however many of its properties run it.
Which companies use Customer.io?
Leader Bank, thyme care and Validity Inc. are among the most prominent in the current set.
What industries use Customer.io?
Information technology and services, professional and business services and financial services lead the set, across 19 industries in total.
What size companies use Customer.io?
Adoption concentrates in the 11-50 employee band, across the companies whose size is recorded.
Where are Customer.io users based?
The United States, Canada, Australia and the Philippines account for most detections, across 13 countries.
How current is this data?
3,648 companies were confirmed in the last 90 days. Last detection 13 October 2026.
