Customer.io Reviews in June 2026: User Ratings, Pros & Cons

"Great platform for custom emails based on sophisticated triggers"

What do you like best about Customer.io? Customer.io is very easy to use. It has a graphical interface for programming email sending rules that is relatively self-explanatory. What do you dislike about Customer.io? So far, I haven't found anything about it to dislike. Recommendations to others considering Customer.io: The difficulty in setup will vary depending on how technical your implementation is - make sure you have a dedicated engineering resource to puzzle through the steps. What ...

"Hard to Setup, Easy to Use Later"

What do you like best about Customer.io? - Lightweight and powerful UI - Very fast - Good price - Email Layouts easy to configure - Easy to define goals, workflows, triggers...it's so "smart" What do you dislike about Customer.io? - Very hard to configure unless you are very technical. Not tracking anonymous users suck (we had to build a workaround on that) - Stats could be improved, you won't get too far apart from standalone reports - Exports are a bit poor - Not that many ...

"Email - done right."

What do you like best about Customer.io? The seamless integration between Customer.io and Segment has allowed our company to send emails intuitively based on specific triggers, filters, and logic. They also provide the tools we require for internal communication within Slack, SMS, Trello and more! With Customer.io emails are the product of logic, not assumption. What more can you want? What do you dislike about Customer.io? Would be very nice to include a built-in email template builder. A ...

"This software will help you campaign for the right customers!"

What do you like best about Customer.io? The one thing I like about this website is the fact that customers can be marketed to with this software. What do you dislike about Customer.io? The only issues with Customer.io is it is too costly, especially with my budget. What problems is Customer.io solving and how is that benefiting you? I noticed that this particular software is aiding me in creating a lifecycle of customers, along with campaigning intelligently for clients who will be good ...

"Technical Debt?"

What do you like best about Customer.io? It works. There are no glitches and they have made an effort to update their backend systems. What do you dislike about Customer.io? Doesn't seem innovative and the WSIWYG capabilities are quite limited. Recommendations to others considering Customer.io: Lots of choices in this crowded marketplace. What problems is Customer.io solving and how is that benefiting you? We are able to contact over 500,000 customers without any issues whatsoever. ...

"Customer.io is a great product to track mass communication"

What do you like best about Customer.io? I love that Customer.io enables me to see how many customers opened my emails. I also like the ease of distributing mass communication to our audiences. What do you dislike about Customer.io? There isn't anything that I particularly dislike about the product, however, we have been using it for less than a year. Recommendations to others considering Customer.io: If you currently don't track email activity, I recommend using Customer.io to start. I ...

"Good tool for lots of email"

What do you like best about Customer.io? pricing model lets us send an incredible amount of emails to our customers. What do you dislike about Customer.io? no html wizard to develop emails so it's difficult to create awesome visual emails without a lot of work Recommendations to others considering Customer.io: Customer.io lets you segment your database and create trigger campaigns so you can send the right email at the right time. The analytics are not robust enough so you have to do a lot ...

"Mass email is difficult"

What do you like best about Customer.io? C.io makes automation easier than most clients and offers powerful tools for technical users. What do you dislike about Customer.io? C.io lack's a "what you see is what you get" editor, making rapid prototyping and iteration difficult for nontechnical users What problems is Customer.io solving and how is that benefiting you? We need a system to communicate to our customers with email. C.io is one of a few puzzle pieces we use to automate this process ...

"Poorly Designed, Unwieldy Email Platform"

What do you like best about Customer.io? Not much. It does have the functionality to set up email campaigns, including drip campaigns. And it does have a basic email editor, allowing you to play with the layout of your email. But beyond having the 'basics,' it is not user-friendly and overall not well-organized. What do you dislike about Customer.io? First, it isn't user-friendly. The UI is not intuitive, so it takes longer to find what you're looking for and accomplish what you're trying ...

"Employment notice emails."

What do you like best about Customer.io? It was user friendly and I liked the data reporting. What do you dislike about Customer.io? I didnt use the program long term. However, I didn't have any issues or dislike for the program. What problems is Customer.io solving and how is that benefiting you? Used at a staffing firm for employment notice emails.