
Customer.io
What Is Customer.io?
Customer.io is the customer engagement platform that enables marketers to build their most sophisticated automated messaging campaigns. With access to your real-time behavioral data, create personalized and relevant messages that engage and retain your customers. Send emails, push notifications, SMS, in-app messages, and more all through an intuitive and powerful visual building experience. Built for scale, Customer.io is used by over 4,600 companies, sending over 8 billion messages per year.
Who Uses Customer.io?
Tech-savvy marketers sending personalized, data-driven marketing, product, and transactional messages. Ideal for mid-market SaaS, FinTech, EdTech, mobile apps, marketplace companies, and more.
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Customer.io
Reviews of Customer.io

Max
The perfect platform to set up product-driven email communications with customers at scale
Comments: What I really like is that we use our own database as the single source of truth, and not the email platform database which is never up to date. With Customer.io we use real-time data from our own platform (B2B SaaS) which helps me as a marketer to always communicate with customer segments in the best possible way. Customer.io provide lots of options to filter based on segments and rules which comes in very handy when you want to create cool workflows. Overall, extremely happy with the platform.
Pros:
Easy-to-use and intuitive email and marketing automation platform. Especially the ability to send out webhooks makes it very strong.
Cons:
The initial set up requires some help from a developer but if you have that sorted out, it's really easy to use.
Chelsea
Alternatives Considered:
One of the best email marketing tools I've used!
Comments: I've been using Customer.io for almost two years and couldn't be happier with our experience! It was super easy to transition from our previous email client and integrate and connect with our other software. It's been an important piece of our marketing strategy and has helped us generate upsells and new leads.
Pros:
I've worked in many email marketing tools over the years and Customer.io is by far the easiest to use for every member on our marketing team! The drag and drop tool has really helped us achieve the same brand look across every email we send - and it's easy enough that even our copywriters can create emails. No designers or developers needed!
Cons:
The only limitation is that I wish the dashboard and interface was a bit more user friendly. I feel like the image library is buried. I feel like there's so many impressive C.io features get hidden. I also wish you set your "Email Settings" in your Team Profile and those settings could be applied to every email instead of manually inputting them each time.
Suzan
Good service, interface somehow difficult and less user friendly than other systems
Comments: Good
Pros:
Great and quick customer service, broadcast function works well
Cons:
The data functions and the somehow difficult interface of campaigns and flow-building
Jeremy
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The marketing campaign tool for any startup, scaleup or e-commerce that want a reliable tool to work
Pros:
The UI/UX is really great and intuitive. It comes with a lot of features and different channels. It can be used by many different types of people, from not knowing how to code at all, to more advanced users. Enabling complex possibilities.
Cons:
Setting up our dedicated preference center required quite some time and resources. Plus it did break native campaign tracking as well as the native unsubscribe button. But they are coming with a new feature on this side really soon.The second pain is focused on data analysis. There is quite some interesting data point, but it can quickly get tough when you try to extract specific behavior or data point. They know about it and are working also on this big part of the product.
Verified Reviewer
Great product
Pros:
Customer.io is very catered towards SAAS products like ours. Very easy to integrate our data sources like Segment, and simple to get attributes and events. Perfect for running onboarding campaign or lead nurturing campaign. It's the most simple to use product compared to everything else I've tried. Dashboard is also very fast despite a lot of data. Not clunky at all. This lets me create and send campaigns in a much shorter time.
Cons:
Quite a bit of jargons in the dashboard, which can be a little confusing. It'll be great if there's more explanation on certain features. Easy to overlook some of their outstanding features because they are hidden.