Customer.io Reviews & Product Details

Customer.io has given us the ability to communicate with our users in a far more targeted and meaningful way. We can now send messages directly across multiple channels, segment our audiences based on behavior or attributes, and design personalized journeys that match each user's lifecycle.

What really stands out is the ability to implement moment-based and event-triggered messaging. This has been extremely valuable for our fintech products, especially for Earned Wage Access (EWA) and salary advances, where timely and context-aware communication significantly improves user engagement and conversion. Customer.io’s workflow builder and event handling make it easy to deliver the right message at exactly the right moment. Review collected by and hosted on G2.com.

Customer.io has been working well for us so far. Pricing may be a consideration for smaller teams or early-stage companies, especially as our user base grows, but it’s reasonable given the platform’s flexibility and the level of personalization it enables. Review collected by and hosted on G2.com.

CIO makes syncing Salesforce data into your customer.io instance straightforward. I appreciated being able to use advanced filtering during the sync process, which allowed us to exclude data we didn't want to import into customer.io. This was especially helpful for keeping us within our contact limit.

When we needed assistance with setting up this filtering, we contacted customer support and were very pleased with both the promptness of their response and the effectiveness of their solutions.

While we primarily use customer.io for its email sending and reporting features, I can also see the value in leveraging it to integrate data from multiple sources. Review collected by and hosted on G2.com.

We are currently using Customer.io as our email sending platform for a business that manages multiple customer types within the same workspace. Each audience requires its own subscription center; however, Customer.io only supports one subscription center per workspace, so we’ve had to build an external solution to handle that need.

Another limitation we encountered was the lack of reply-based message management (RMM). Unlike our previous ESPs, Customer.io does not automatically unsubscribe contacts who reply with “STOP” or “Unsubscribe.” We had to develop a custom workaround for this as well.

When migrating our suppression list from our previous ESP, we were informed by support that we could not upload it as a true suppression list. Instead, we had to import it as a list of contacts marked as Unsubscribed. This approach caused those contacts—who should not be emailed—to count toward our total contact volume. It was also confusing to see conflicting information between the support team and the online documentation, which suggested that suppression lists could be imported by contacting support. Ultimately, we imported the list as unsubscribed contacts and repeated the process for each workspace.

Additionally, the help documentation can be sparse, particularly when troubleshooting specific issues. The AI chatbot doesn’t always provide accurate or complete guidance and could benefit from further development. On a positive note, when we’ve reached out directly, the Customer.io support team has been responsive and helpful. Review collected by and hosted on G2.com.

This platform is very powerful and has robust features allowing us to have a lot of options in how we want to build campaigns, workflows, and segments. For the majority of projects, as long as we can think of setting something up, customer.io allows us to do so. Review collected by and hosted on G2.com.

Often times it can get laggy and slow, especially for larger campaigns. Every few weeks I encounter issues with 1-2 hours where the entire platform is slow in loading screens which can be frustrating. Review collected by and hosted on G2.com.

The interface and flow builders are super intuitive, and the ability to copy/move flows between different workspaces has meant that it has been quick and easy to build out complicated journeys across different products internally. The onboarding and customer support were great through the pre and post-sales process. Review collected by and hosted on G2.com.

I can't think of any initially, possibly just the sheer scale of features makes it a little difficult to know where to start. We are also dealing with 5+ different data sources, so getting those in has proven tricky - this is more a symptom of tech stacks though rather than the platform. Review collected by and hosted on G2.com.

The best thing about using CustomerIO is the way we’ve simplified communication with our users. We don’t need to manually answer to them, we’ve setup different campaigns for transactional emails. Plus, we’re able to convert a lot of users into paying customers through our email marketing campaigns. Review collected by and hosted on G2.com.

There isn’t something to dislike about CustomerIO, per se. We’re loving the experience so far. It’s actually getting better as we get used to the platform and discover new things and features. Review collected by and hosted on G2.com.

Customer.io is very powerful and intuitive for designing email campaigns for users from a beginning welcome series to sending out one off transactional emails based on various conditions. Customer.io definitely excels in making it easy to track and use attributes assigned to customers. In addition any time I've had any issues their customer support is top notch. Review collected by and hosted on G2.com.

It can be somewhat expensive for a smaller company that doesn't send out a large volume of emails. The pricing is determined by the number of customers you have, which I find less than ideal, since it feels like you're penalized for having more users, even if you aren't emailing all of them. They do recommend removing inactive or unresponsive users from customer.io, but managing this process is inconvenient, and you never know when you might want to contact those users again. While there are certainly ways to work around this, it still feels like a significant frustration and a kind of penalty for small, growing companies. It would make more sense to focus on the number of emails or notifications sent, rather than the size of your user base. Review collected by and hosted on G2.com.

CIO has been evolving quickly and intuitively, effectively becoming the forcing function at our end to catch up. The visual workflow builders, AI automations and the granular control the platform has been giving over complex journeys and campaigns is unmatched. I've been using the tool for 2+ years now and I’ve never had any complaints. Beyond everything, as a marketer, I think the company as a brand does amazing work - it applies B2C principles of communication seamlessly to an otherwise boring B2B category. It's been a pleasure. Review collected by and hosted on G2.com.

If the platform help with data hygiene and there was more control over segmenting beyond the two set identifiers, it would make a world of difference. Review collected by and hosted on G2.com.

The platform offers impressive flexibility, and the customer support truly stands out as among the best in the industry. They genuinely care about user feedback and actively work on implementing requested features. The documentation is not only beautifully presented but also remarkably thorough, covering even highly specific topics. Review collected by and hosted on G2.com.

I find the platform is probably not as intuitive as it could be, especially since I sometimes see my coworkers struggling with certain aspects. However, I believe this may just be a matter of how much time one has spent using it. I still have a lot to learn myself, but overall, I think the platform is absolutely fantastic. Review collected by and hosted on G2.com.

I use Customer.io daily to send bulk emails and run targeted campaigns. It’s easy to use, simple to implement, and integrates well with other tools. The segmentation and automation features help send the right mails to the right persons, and their customer support is always responsive and helpful.” Review collected by and hosted on G2.com.

The platform has a bit of a learning curve at the start, especially when setting up advanced workflows. Pricing can also feel high for smaller businesses as the contact list grows. The interface, while powerful, could be made a little more intuitive for beginners. Review collected by and hosted on G2.com.

I like how powerful and flexible the automation system in Customer.io is. The workflow builder makes designing customer journeys incredibly easy, whether they are simple drip sequences or complex, multi-step flows. Everything is visual, logical, and easy to adjust. Once a workflow is created, the system handles everything automatically, so I don't have to manually send anything or track who needs what. The initial setup was fairly smooth and straightforward, with clear documentation that guides you through the basics like connecting your data source and setting up events. After mapping the events and attributes correctly, building the first workflow and sending test messages was simple. Review collected by and hosted on G2.com.

The learning curve can be steep. Because the platform is so flexible, it can take time for new users to understand all the features, especially advanced workflow logic and segmentation rules. Reporting could be deeper. The analytics are good for basic insights, but more detailed reporting—like journey-level analytics, funnel views, and cross-campaign comparisons—would make optimization easier. Visual builder sometimes feels crowded. When a workflow becomes large with many branches, the visual layout can get cluttered and harder to navigate. Testing complex flows is challenging. Testing multi-branch journeys or event-triggered steps can require extra effort, and sometimes the test results aren’t as clear as they could be. One area that could further enhance the platform is more real-time validation and previews inside the workflow builder. Review collected by and hosted on G2.com.