I really like the interface of Customer.io; it feels easy to use and has a clean, clear design. I love the customer support team. Everyone is always helpful with any questions, and I can submit queries right as I'm working on a campaign. They can help me with my questions. I appreciate the ability to set up blogs and time delays to create campaigns. I also like that I can send newsletters either right away or schedule them for a specific time. Overall, the interface and customer support are the main features I appreciate. Review collected by and hosted on G2.com.

Sometimes when I'm creating a campaign, there are features that seem missing, like setting an email to be sent on a specific weekday. The options for controlling delays aren't very extensive or varied. Also, if I create a campaign for one segment of clients and later want to add another segment to the same campaign, it doesn't recognize everyone already in the segment and only picks up new users. Adding additional segments to a campaign after it's already created would be helpful. There was a bit of a learning curve at the start to learn how to use it. I would have liked more educational videos on specific topics to help with setup initially. Review collected by and hosted on G2.com.

I really love Design Studio in Customer.io because it lets me completely and flexibly design my emails. As a front-end developer, I always use code, and having the code tool integrated makes it so easy to use. It's super handy and enhances my speed and productivity, especially when designing a new email update. I just have to do it once, and with the help of an AI tool, updates are quick, taking barely five minutes. Plus, I can see the design live next to the code, which is a really good user experience. I also loved the new user interface; it's even easier and better. Review collected by and hosted on G2.com.

I couldn't find how to write a very plain email without design elements in Customer.io, like sending it from my phone. I had to use a workaround with code because there's no direct button for that. Also, there's no functionality for sending a threaded email, which would really help, especially in stacking emails one under the other in an automated workflow. Review collected by and hosted on G2.com.

I use Customer.io for lifecycle marketing, particularly newsletters and in-app pushes. It gives me a fast and easy way to engage with my customers. I really like the newsletter functionality because I can easily edit it in HTML to maximize functionality and achieve the look and feel I'm looking for. The ability to use HTML is great because I can leverage AI to create dynamic newsletters. I don't have to settle for out-of-the-box templates. If I can think of something, I can make it and put it in a newsletter. Review collected by and hosted on G2.com.

Sometimes the fact that the newsletter is an HTML prohibits me from speed to market. Yeah being that everything's an HTML I have to type everything out and that sort of sucks sometimes. It will be great if I could like build my own templates that I use. Review collected by and hosted on G2.com.

Customer.io is truly a comprehensive tool, especially for emails where you can do a lot of things. In the workflow, I have access to statistics, which allows me to closely monitor, understand our users' habits, and be able to really reach those we need to contact. Very efficient. Review collected by and hosted on G2.com.

The interface is a bit heavy, so with a Windows computer, it's still quite complicated, it becomes sluggish, so sometimes you click and it doesn't respond right away. I would say that it's the interface that's there for a browser with an average computer, it can be more difficult. Review collected by and hosted on G2.com.

I like using Customer.io because it allows me to focus on the content of emails while letting developers handle the data aspects. The design studio is a good tool that lets me quickly create emails that look nice on both mobile and desktop. I also appreciate the workflow capabilities that let me create different branches and customize when emails are sent based on data-associated conditions. The help documentation has been a good source for learning how to create emails and format liquid syntax, and the initial setup was relatively easy with the help of the documentation. Review collected by and hosted on G2.com.

Fields associated with date and time are frustrating. I don't see any reason why the UNIX timestamp format needs to be used to compare dates for logic within liquid code or within the workflow. It should allow a regular date time stamp in ISO format to do the same thing. I also would prefer to have more control over field formats when creating fields associated with customers or events. Right now, fields are very flexible, which can be powerful, but I would prefer to specify field types to enforce the data format. Review collected by and hosted on G2.com.

I like the variety of messaging that Customer.io allows. Not only does it have email campaigns, but I can also use in app messages and broadcast. It even integrates into what we call our marketing site for anonymous messages, which are for users that are not registered or signed into any account. Additionally, the initial setup was fairly simple, and Customer.io did a pretty good job of providing onboarding and the knowledge needed to get it working correctly. Review collected by and hosted on G2.com.

I would like more notification preferences. So, for example, if a customer fills out a form and submits it or some sort of action is taken within Customer.io campaign, for me to be notified via email and not have to go to the Customer.io dashboard to see these types of actions. Review collected by and hosted on G2.com.

I really like the broadcast feature in Customer.io. We send a lot of one-off eblasts, and it's helpful to duplicate a broadcast, edit, and send. I have about 5 different broadcast templates that I use right now, including a monthly newsletter for our company, webinars, white-labeled broadcasts for another segment, and personalized broadcasts that look like they come from someone on our team to get more engagement. Customer.io helps me manage a high volume of communication without losing personalization. As I'm the only person in my department, I need to quickly and simply automate campaigns, tailor messaging, and reach caregivers across different stages and segments, as well as business development professionals to get more leads. Review collected by and hosted on G2.com.

Building emails sometimes gets clunky. It feels rigid with the rows, and I wish it was a little more forgiving when wanting to place an asset inside the email. I wish we could place assets wherever we wanted and add GIFs. There is also a significant learning curve with Customer.io, which can be quite challenging. Review collected by and hosted on G2.com.

I like the fact that I can set up a campaign really quickly with Customer.io, and it uses a very logical flow. It doesn't require anyone technical to help implement it, making it so much easier. We switched from EmailOctopus, and importing all the emails into Customer.io was very easy. Also, Customer.io makes it more efficient for us to act quickly. When a developer tells me that a feature has been released, I can ensure an in-app message goes out to all our users within half an hour, which is really quick to set up. It's a tool that helps us communicate with our users efficiently. Review collected by and hosted on G2.com.

I probably don't use the new AI agent. I only use the campaign notifications. What I haven't done yet is the notifications that are done off a certain action in the app. Because that's what one of the developers set up. So I'd like to know how I can make more use out of that. Maybe tips and tricks. If it notices that, like, you got a really high bounce rate or a really high undelivered rate, or no one's opened them, just flagging it—like, 'hey, guys, this isn't normal' and looking at our data and our campaigns and suggesting things to me proactively. Review collected by and hosted on G2.com.

Being able to build sophisticated, branching campaigns without needing a developer is top-tier. I rely a lot on Liquid templating and event/attribute filtering to create highly personalized flows that respond to real-time behavior. Review collected by and hosted on G2.com.

The platform doesn’t natively expose historical event counts in Liquid, which forces me to rely on manual workarounds—like incrementing attributes—to track how often certain activity happens. Review collected by and hosted on G2.com.

I use Customer.io to track data and make decisions based on the information it provides. I appreciate how it takes communications out of our developers' hands and puts them into the hands of marketers, which has been a really good change for us. I also like that it gives us clear visibility into what's happening with each person and allows us to monitor communications and performance effectively. Review collected by and hosted on G2.com.

Setting up the initial email layout templates can be a bit confusing, especially with CSS preprocesses and knowing when to include them and when not to. I think I need to revisit my templates to ensure they're using best practices. That's probably the main area for now. Review collected by and hosted on G2.com.