Customer.io Reviews & Product Details

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.

We use Customer.io for email broadcasts, marketing emails, and newsletters. We’ve also tried Mailchimp before, but with a list of around 50k emails, Customer.io handles everything smoothly and does a great job. I also really like the new Email Content Analysis and Design Studio features, they make it much easier to build emails and quickly check subject lines and content before sending. Both have been very useful for me in day-to-day campaigns. Review collected by and hosted on G2.com.

The only thing I’d like to see improved is the limited font options. It would be great if we could use our website’s font set directly in email campaigns for better brand consistency. Review collected by and hosted on G2.com.

I've been a loyal Customer.io user for several years now, and I continue to be impressed with their service. Recently, Customer.io proactively reached out to me and offered to upgrade my plan from "Legacy" to "Premium" - and amazingly, despite getting access to more advanced features, I'm now paying 30% less! I really respect them for this customer-first approach.

I'm particularly impressed with their Customer Data Platform solution, which allows seamless integration of various data sources into the CRM. This makes it incredibly easy to add new customers, generate events, and manage data flows. It's an excellent solution for technical marketing teams who want to maintain independence without constantly relying on IT resources. Review collected by and hosted on G2.com.

I'm looking forward to seeing continued development of the CDP capabilities. Specifically, Customer.io should consider adding device synchronization features - the ability to add, modify, and manage user devices would be a valuable enhancement to the platform. Review collected by and hosted on G2.com.

Customer.io continues to impress me with how quickly it evolves. The platform now feels even more user-friendly, especially with recent improvements to the visual workflow builder — it’s smoother and makes building complex journeys faster. I really appreciate the expanded analytics and reporting options; they make it easier to see how each step of a campaign performs and to optimize in real time. The new message editor is also a great addition, giving more flexibility for personalization and testing. Combined with its solid segmentation and event-based triggers, it remains one of the most powerful tools for lifecycle marketing I’ve used. Integration with other apps is still seamless, and the overall experience keeps getting better. Review collected by and hosted on G2.com.

Everything’s working great now — I don’t have any improvement suggestions at the moment. Review collected by and hosted on G2.com.

Everything about the platform is straightforward and user-friendly. A fantastic new feature I love is the Design Studio, which makes it incredibly easy to create on-brand templates and ensures we consistently respect our graphic charter. It's a huge time-saver! I highly recommend it to anyone looking for an efficient and reliable messaging solution. Review collected by and hosted on G2.com.

While the platform is excellent, I'd love to see more robust and user-friendly tools for data management. Specifically, a simpler way to identify and delete obsolete or unused customer attributes would be a huge help in keeping our workspace clean and efficient. Review collected by and hosted on G2.com.

Customer.io keeps getting better with every update. Beyond the flexible workflows, advanced segmentation, and seamless integrations I’ve always appreciated, the platform has recently added some really valuable features:

Smarter SMS & WhatsApp: We can now automatically handle SMS replies (like STOP/UNSUBSCRIBE or even custom keywords) and use branded domains for shortened links, which has improved both trust and engagement.

Better Scheduling: Newsletters can be rate-limited and delivered in each user’s local timezone, making campaigns feel more personal while protecting deliverability.

AI Enhancements: The platform now suggests descriptions for data attributes/events and even analyzes survey feedback with AI, which saves our team time and improves clarity.

Improved Analytics: The new deliverability dashboard gives detailed insights into engagement and inbox placement across different providers.

Modernized In-App Messaging: The upgraded in-app editor is much smoother and more powerful than the legacy version (which sunsets in 2026).

Overall, these updates show that Customer.io is not just keeping up with the market but pushing ahead. It’s become an even more complete and reliable platform for personalized, multi-channel communication. Review collected by and hosted on G2.com.

While the platform is excellent overall, there are still a few areas where it could get even better:

Documentation depth: Some of the more advanced features (like AI tools, deliverability dashboards, or complex event/attribute setups) could benefit from more in-depth tutorials and real-world examples.

UI performance: The interface is powerful but sometimes feels a bit heavy or slow to load, especially when managing larger workspaces or big datasets.

Learning curve: With all the new features being added, it can take time for new team members to fully understand how to best use everything. A more guided onboarding or contextual help could smooth this out.

Pricing transparency: The platform is enterprise-ready, but clearer pricing tiers for scaling SMS, WhatsApp, and advanced analytics would make planning easier.

These are relatively minor compared to the value Customer.io provides, but addressing them would take the user experience to the next level. Review collected by and hosted on G2.com.

CIO is constantly coming up with new features/tweaking existing features to make it easy for someone with minimal CRM or coding experience to set up campaigns. One particular feature that i love using is the steps on in-app - previously we would have to create multiple in-apps and manually link them together, now everything can be done on the same screen. Review collected by and hosted on G2.com.

Really happy that my previous suggestion was taken into consideration, we now can see how many % of clients in a particular segment has already received more than 1 msg in the last 7 days. An improvement top of mind is - lets say today i want to send a broadcast to a list of audience - i want to e able to know before i hit send that x no. of clients wont receive this email because of the send limit rate. We can compulsory notification and optional marketing comms going out, compulsory notifications shouldnt be counted in send limit. Review collected by and hosted on G2.com.

What I really like about Customer.io is its intuitive and user-friendly interface. It’s very easy to understand and navigate, which makes my daily work smooth and efficient. I also find it simple to train others on the platform, which is a big plus.

I appreciate the ease of implementation — for example, setting up admin passwords and making necessary changes is quick and hassle-free. The customer support team has also been very responsive and helpful whenever I needed assistance, which gives me confidence in using the platform. Additionally, the ease of integration with other tools makes workflows much more seamless, saving time and effort. I use this platform every single day. Review collected by and hosted on G2.com.

I rated Customer.io an 8 mainly due to recurring access issues. Even when we already have access, we often face problems logging in or navigating certain features. At times, resetting or setting a password becomes time-consuming because the system logs us out repeatedly, which delays our work. While the platform is otherwise effective, these access challenges impact efficiency and prevent a higher rating. Review collected by and hosted on G2.com.

They recently released the Design Studio, which makes it much easier to have a consistent brand across all of our content and communications. Our designer was able to go in and redesign all of our emails, and I then recreated our email campaigns. Segmenting users is relatively easy as well, whether manually uploaded or automated. It was easy to learn and implement newer features, their customer support is always responsive, and it integrates well with the rest of our software stack. I use it multiple times a week and never run into any issues. Review collected by and hosted on G2.com.

One thing we are struggling with is targeting visitors to our site who have not signed up for a trial yet. We are only able to send communications to people with a User ID as of now, so we are having to use a different platform for those marketing efforts. Review collected by and hosted on G2.com.