Customer.io
Customer.io is a behavioral messaging platform for triggering personalized and event-based customer communication.
Market Share of Customer.io
Current Customer(s)
1791
Market Share (Est.)
29.23%
Ranking
#1
Top Competitors and Alternatives of Customer.io
The top three of Customer.io’s competitors in the Email Personalization category are SmartrMail with 12.32%, RetailRocket with 9.16%, Movable Ink with 8.27% market share.
| Technology | Domains | Market Share (Est.) | Versus page |
|---|---|---|---|
| SmartrMail | 755 | 12.32% | Customer.io vs SmartrMail |
| RetailRocket | 561 | 9.16% | Customer.io vs RetailRocket |
| Movable Ink | 507 | 8.27% | Customer.io vs Movable Ink |
| TargetBay | 493 | 8.05% | Customer.io vs TargetBay |
| SmarterHQ | 417 | 6.81% | Customer.io vs SmarterHQ |
| Emma | 368 | 6.01% | Customer.io vs Emma |
| Blueshift | 361 | 5.89% | Customer.io vs Blueshift |
| Dialog Insight | 205 | 3.35% | Customer.io vs Dialog Insight |
| WhatCounts | 184 | 3.00% | Customer.io vs WhatCounts |
| NiftyImages | 126 | 2.06% | Customer.io vs NiftyImages |
| Reply | 109 | 1.78% | Customer.io vs Reply |
| Yet Another Mail Merge (YAMM) | 93 | 1.52% | Customer.io vs Yet Another Mail Merge (YAMM) |
| TextExpander | 50 | 0.82% | Customer.io vs TextExpander |
| Sendspark | 20 | 0.33% | Customer.io vs Sendspark |
| Traqli | 16 | 0.26% | Customer.io vs Traqli |
| Strands Retail | 11 | 0.18% | Customer.io vs Strands Retail |
| Parcel | 11 | 0.18% | Customer.io vs Parcel |
| Knowmail | 10 | 0.16% | Customer.io vs Knowmail |
| Oracle Siebel Email Marketing | 10 | 0.16% | Customer.io vs Oracle Siebel Email Marketing |
| Gmelius | 8 | 0.13% | Customer.io vs Gmelius |
Popular Comparisons
Top Competitors and Alternatives of Customer.io
The top three of Customer.io’s competitors in the Email Personalization category are SmartrMail with 12.32%, RetailRocket with 9.16%, Movable Ink with 8.27% market share.
Customer.io vs SmartrMail
Customer.io vs RetailRocket
Customer.io vs Movable Ink
Customer.io vs TargetBay
Customer.io vs SmarterHQ
Customer.io vs Emma
Customer.io vs Blueshift
Customer.io vs Dialog Insight
Customers of Customer.io
Around the world in 2025, over 1791 companies have started using Customer.io as Email Personalization tool.
| Customers | Employee Range | City | Region | Country | Social Links |
|---|---|---|---|---|---|
| PwC | 10,000+ | London | England | United Kingdom |     |
| Five Below | 10,000+ | Philadelphia | Pennsylvania | United States | |
| Formula 1 | 10,000+ | London | England | United Kingdom | |
| Ciena | 10,000+ | Hanover | Maryland | United States | |
| Gartner | 10,000+ | Stamford | Connecticut | United States | |
| SNCF | 10,000+ | Saint-Denis | Ile-de-France | France | |
| Studio Moderna | 5,000 - 9,999 | Zagorje ob Savi | Zagorje ob Savi | Slovenia | |
| Biola University | 5,000 - 9,999 | La Mirada | California | United States | |
| WebstaurantStore | 5,000 - 9,999 | Lancaster | Pennsylvania | United States | |
| Buffer | 5,000 - 9,999 | San Francisco | California | United States | |
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Customer.io Customers by Products and Services
The top three products and services offering customers that use Customer.io for Email Personalization are Saas (41), Technology (34), Fintech (24).
Customers
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Customer.io Customers by Employee Size
The majority of Customer.io's customers for the email-personalization category fall in the company size of 0 - 9 employees (538 companies), 20 - 49 employees (516 companies), 100 - 249 employees (242 companies).
Employee Size
Customer.io Customers by Geography
The top three geographies of Customer.io for email-personalization are the United States with 956(62.48%), Brazil with 186(12.16%), United Kingdom with 105(6.86%) customers respectively.
Customers
Employees of Customer.io
Also see other Products/Services by Customer.io in:
FAQ
Find answers to the most often asked questions by users.
Who are the top Customer.io competitors?
Customer.io’s Top competitors in the email-personalization category are SmartrMail, RetailRocket, Movable Ink. You can view a full list of Customer.io competitors here. 6sense uses advanced data mining and AI algorithms to track customers and competitors of Customer.io and 40,000 other technologies on the internet. You can also compare Customer.io and its feature with top competitors here : Customer.io vs SmartrMail Customer.io vs RetailRocket Customer.io vs Movable Ink.
What is Customer.io customer distribution based on company size?
What is Customer.io market share in the email-personalization?
What are the top countries that use Customer.io?
What are the top industries that use Customer.io?
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