It’s the best choice if you have a complex product and want to send messages that actually feel personal and timely , rather than just "blasting" a list. It rewards you for having good data. Review collected by and hosted on G2.com.

The learning curve is pretty steep if you aren't tech-savvy, and the pricing can get really expensive as your user list grows. Review collected by and hosted on G2.com.

the thing that actually changed how i use it is realizing customer.io thinks in events, not campaigns. i came from mailchimp and kept trying to do the same thing, make a list, schedule a blast. it kept fighting me until that clicked.

now i can say: when a user creates their second project but hasn't invited a teammate in 48 hours, send this email. that level of precision would have taken me three tools before.

the journey builder took about two weeks to get comfortable with. the "wait until" block is the one i use most, it holds a message until a condition is true instead of just waiting a fixed number of days. replaced two zaps i had running just with that.

liquid templating felt intimidating at first but the docs are genuinely good. once you get the syntax down you can pull in things like a user's last active feature directly into the email copy. makes a big difference in how the message lands.

support is solid. asked a question about suppression lists late at night, had a real answer by morning that actually referenced my account setup. not a template. Review collected by and hosted on G2.com.

pricing caught us off guard. grew past the 5,000 profile tier in about 3 months and the next tier was a big jump. felt like there should be something in between for where we were at that point.

the email editor is my least favourite part. it works but it always feels a step behind klaviyo or beehiiv. i ended up designing in figma and hand coding templates through parcel which is their separate email editor. it works but its extra steps every time.

the bigger issue if you're a solo marketer is the setup. customer.io is api-first which means someone has to actually instrument your product events properly. when our dev was stuck in a sprint i was basically blocked for two weeks on the onboarding flow i had planned. nothing i could do until he was free.

if you don't have a developer available when you're getting started, factor that in before you commit. Review collected by and hosted on G2.com.

It’s a very user-friendly platform that allows users to manage automated journeys and create email templates without needing technical skills. It also includes AI tools that support QA for journeys and campaign templates.

The drag-and-drop email template builder makes it easy to build campaigns efficiently and reduces the need to constantly cross-check how templates render across different screens. I also like that this feature has now been released for in-app messages as well, which is great. Review collected by and hosted on G2.com.

I wish I could track SMS deliveries and opt-outs directly within CIO. I also wish it were easier to compare campaign and journey performance within the platform. Finally, I’d like access to additional contact behaviour insights and more detailed campaign analytics, which could also potentially enable the creation of more advanced segments directly within the platform. Review collected by and hosted on G2.com.

The customer support is very helpful - they are always available to book a call and answer questions we have with the platform. The platform allows us to easily design our own email campaigns without having much experience in CRM Review collected by and hosted on G2.com.

It is not easy to tag people on our list so that we can create various groups Review collected by and hosted on G2.com.

I think Customer.io's UI is pretty great, especially when it comes to marketing automation. The fact that it connects to so many different things allows us to market to our users better. I believe the customizations that come with different objects and attributes within events or users are great, and the UI with the campaign design is pretty awesome. The user experience and interface are a lot easier to use and more friendly compared to others I've used in the past like Marketo. I think the different channels within Customer.io, such as SMS and in-app messaging, are pretty nice, and the native integrations are really helpful. When you look at Customer.io's layout, it's pretty great and usually well set. Review collected by and hosted on G2.com.

One thing that's come up is the fact that events are immutable. They're unable to be changed. I think that's a slight annoyance. Whether you're talking about event attributes or events themselves, sometimes they do change. Being able to change the greater ecosystem of attributes would be good too because those change, and I have cleanup. But I understand. Review collected by and hosted on G2.com.

What I like best is how Customer.io evolves based on real customer feedback. I feel like they’re listening to their users and building features that help marketers create more personalised, higher-quality email campaigns. Every improvement feels like it’s designed to make our work more effective and our own customers’ experiences more personalised. Review collected by and hosted on G2.com.

The biggest drawback for me is the limited reporting capabilities. While you can get basic insights, digging deeper often requires workarounds or exporting data to analyse elsewhere. It’d be great to see more flexible, built-in reporting tools that allow marketers to get a fuller picture from within the campaign/broadcast in the platform itself. Review collected by and hosted on G2.com.

One thing I really like about Customer.io is the clean and intuitive UI/UX. The platform feels well-organized, making it easy to navigate through campaigns, workflows, and customer data without a steep learning curve. The workflow builder is especially smooth and visually clear, which helps in creating and managing automations efficiently. Overall, the user experience feels polished, modern, and productivity-focused. Review collected by and hosted on G2.com.

It only offers email support. I think they should also provide call support, at least for premium customers. Also, pricing is a little bit higher. Review collected by and hosted on G2.com.

I like the contact attributes, the ease of use in Design Studio, and the AI integration. Review collected by and hosted on G2.com.

I wish that there was more ability to organize different email designs within Design Studio. I have multiple types of emails in the software and am having trouble understanding the best way to organize designs in ways that serve multiple needs. Review collected by and hosted on G2.com.

We really enjoy the Design Studio features and the ability to connect to an LLM. The platform is easy to navigate overall, and the search feature makes it even simpler to find what we need. Review collected by and hosted on G2.com.

It can be clunky and tends to freeze. The bee editor does not autosave, and work can be lost. There were basic features, such as advanced reporting and the ability to resend a campaign, that were not native. The test-and-learn feature is not robust—there is no easy way to test at a specific time of day. Liquid logic is not always stable and can break. Review collected by and hosted on G2.com.

The setup was easy, and I really like having an agent who helps me with technical issues. As a non-tech founder, this has helped me a lot and made the whole process much smoother. Review collected by and hosted on G2.com.

Haven't found any yet; all working fine. Review collected by and hosted on G2.com.