Customer.io Reviews and Ratings

Rating: 9.1 out of 10

Score

9.1 out of 10

Community insights

TrustRadius Insights for Customer.io are summaries of user sentiment data from TrustRadius reviews and, when necessary, third party data sources.

Pros

User-Friendly Email Flow Creation: Many users have found the email flow creation feature to be very user-friendly, even for those without coding knowledge. They appreciate the ease of creating visually appealing newsletters with this feature.

Effortless Segmentation Capability: The segmentation capability of the product has been highly praised by multiple reviewers. It is effortless to segment users in multiple ways, allowing for better targeting in campaigns and improving overall campaign effectiveness.

Great Customer Support and Documentation: Customers have described the customer support and documentation provided by the company as great. They appreciate the assistance received through chat, calls, and screen sharing, indicating that the support team is willing to help extensively.

Reviews

18 Reviews

My All-time Favorite Email Marketing Software.

Rating: 10 out of 10

Incentivized

January 6, 2026

Use Cases and Deployment Scope

We use it for all things email marketing. If I’ve to list, these are the things I use CustomerIO for: - email marketing sequences - weekly newsletters - transactional emails - lead nurturing campaigns - audience segmentation and retargeting - tracking app activity and segmenting users - and others.

Pros

I really like its new feature where AI provides suggestions about the email.
New drag-and-drop email editor is much better compared to its traditional.
I really enjoy segmenting users. It really helps us with purchase and activity tracking.
Recommended send time feature is also a great addition.

Cons

I would love to see some more font options. I wanted to have the fonts that we use on our website for the email as well, but it doesn't have that option.
Integrating web forms can be a pain sometimes, but its also not a major drawback.
No evident suggestions as such, it's been good so far otherwise.

Likelihood to Recommend

Talking from the perspective of a marketer at a SaaS with average. 50K email subscribers, Customer IO has been an excellent tool for us. Our requirements include sending users newsletters, marketing emails, and transactional emails, running lead-nurturing campaigns, and more. For a comprehensive use case like ours, CustomerIO is great. While it also has a learning curve, when you have such requirements, it’s worth it. I don’t think CustomerIO is the best fit if you have basic requirements like only weekly newsletter emails.

Ajay Jagtap

Head of Growth Marketing in Marketing at Upmetrics (11-50 employees)

Vetted Review

3 years of experience

My favorite ESP today

Rating: 10 out of 10

Incentivized

November 3, 2025

Use Cases and Deployment Scope

We use Customer.io as our ESP and CRM platform, for batched emails as well as automated user journeys including emails, in-app messaging and push notifications. We pass all of our user attributes and events seamlessly via Segment. Customer.io powers all of our Lifecycle initiatives to convert registered to trial, trial to paid and subscriber retention.

Pros

Email building + showcasing metrics (human opens vs bot opens)
Multi-channel support, continuously improving and adding new channels.
Pricing is very fair for all the features that are given.

Cons

Customer.io needs to be more known! I don't know why they don't come up as a direct competitor to Iterable and Braze.
Their new Design Studio drag + drop tool could be improved with further customization.
Reports aren't the strongest - I use Amplitude to do all my Customer.io reporting.

Likelihood to Recommend

Great for companies with a lot of user + event data and want to take a multi-channel approach. A smaller company with <250k users would probably suffice with a smaller ESP, unless the growth plan is to go at least 500k and up.

Sue Cho

Head of Lifecycle Marketing in Marketing at Monarch Money (51-200 employees)

Vetted Review

2 years of experience

View profile

Great

Rating: 9 out of 10

Incentivized

November 1, 2025

Use Cases and Deployment Scope

Email, Push notifications, sms, and managing all the communications with the client in one place.

Pros

Building automated workflow, really intuitive
Email design
Push notifications

Cons

In app messages can be better
Every time I duplicate a campaign, it does create a copy of the template. I would like to have the option to use a single template in multiple messages
Everything else is great

Likelihood to Recommend

If you want to have every communication in one platform, it is great.

Nelu Cebotari

Product designer in Engineering at Volt (11-50 employees)

Vetted Review

1 year of experience

View profile

Intuitive easy-to-use and drives measurable ROI

Rating: 10 out of 10

Incentivized

October 30, 2025

Use Cases and Deployment Scope

We use Customer.io to handle email marketing automation, in-app messaging, as well as lite CRM duties. We also use it to sync data back to ad platforms, as well as our application itself. It enables us to better engage with current customers and provide value - as well as a path to revenue.

Pros

Email marketing
In-app messaging
Data sync to paid platforms

Cons

Data analysis
Proactive, AI-driven campaign optimization

Likelihood to Recommend

Customer.io is terrific for building out both simple and sophisticated email flows, deploying in-app messaging, and, overall, engaging with customers and users quickly and easily.

Verified User

Director in Marketing (51-200 employees)

Vetted Review

7 years of experience

Great tool a little pricy though

Rating: 10 out of 10

Incentivized

October 28, 2025

Use Cases and Deployment Scope

We used Customer.io to send marketing and lifecycle emails and push messages to all of our companies leads and members with updates on their journey with us. We used a mix of emails and push messages and in-apps since we have both an app and a mobile app. We were very happy with the tool. The only caveat was the pricing model that bills for all users in the account regardless of if they logged in recently or not...

Pros

Flows that combine both emails and push notification
Very easy to build new flows
Conversion tracking is also very easy to set up and the results are trustable

Cons

Too pricy if you're a company with a lot of contacts
Ideally I'd want to see an analytics section with some overall stats

Likelihood to Recommend

Customer.io is really well suited to companies that have a mix of users that have their app and ones that don't. It can easily segment users that have the app and send them push messages and emails to the users that don't have the app. In my opinion, this is really their biggest pro. You can also combine text messages and in-app notifications.

Verified User

Vice-President in Marketing (11-50 employees)

Vetted Review

2 years of experience

Customer.io review

Rating: 9 out of 10

Incentivized

October 28, 2025

Use Cases and Deployment Scope

Customer.io is the primary and major marketing communication tool for our clients and it's indispensable in our tech stack. We've been using it for 2 years now and the use cases of the tool have grown exponentially along with our userbase.

Pros

Segmentation
Intuitiveness of the tool
Exceptional support

Cons

In-app messages needs to allow an option for feedback to create that 2-way loop

Likelihood to Recommend

Customer.io has been helping streamline lifecycle communications for our post-sales user base. The scope for in-depth segmentation helps campaign plan optimally. I find it challenging to work with in places where I need data to flow out of Customer.io into other tools in my tech stack.

Sneha Dhakan

Lifecycle Marketing Manager in Marketing at Xello (201-500 employees)

Vetted Review

2 years of experience

View profile

Highly recommend Customer.io

Rating: 10 out of 10

Incentivized

October 27, 2025

Use Cases and Deployment Scope

We use Customer.io for both transactional and non-transactional messages to our customers. Customer.io allows us to effectively segment users into audiences and then design drip campaigns across email, automated SMS, and direct mail. It also enables one-off winback blasts. Customer.io also allows for tracking metrics (open, click, and unsubscribe rates) and running A/B tests to optimize campaign performance.

Pros

Easy to build audience segments.
Excellent UI for crafting campaigns.
High-quality analytics display.

Cons

Support Team could be better trained to be more helpful.
Allow monitoring of sender reputation.
Add the ability to QA emails across different email service providers.

Likelihood to Recommend

I would highly recommend Customer.io -- I think it makes it easy to launch new campaigns, to run experiments, and to track results. If you're looking to build marketing flows, launch one-off blasts, send transactional comms / updates, or integrate with AI, then Customer.io will serve your purposes. Lastly, they're actively enhancing the platform on a regular basis, so I expect it to be even better a few months from now.

Stephen Kelly

Product Manager in Product Management at Ethos (201-500 employees)

Vetted Review

6 years of experience

View profile

Customer.IO Marketing Review

Rating: 9 out of 10

October 24, 2025

Use Cases and Deployment Scope

We use Customer.io to send mail, push and in-app messages to our users (active or not) with the main focus on engagement and secondly on user acquisition. Also, it allow us to integrate it to our datawarehouse and segment the users as we like

Pros

Easy to use with the workflow map
Easy to integrate with other applications (Redshift in our case)
Creation of segments according events or attributes

Cons

would be great to have an AI assistant/hepler to automate and create emails
the translation new featurue doesn't translate too well... it has issues translating english to spanish or portuguese

Likelihood to Recommend

It's an all round platform for mailing campaigns. Easy to use and with lots of functionalities that can help you automate lots of things. Also very collaborative to use with a team.

Verified User

Manager in Marketing (51-200 employees)

Vetted Review

2 years of experience

Customer.io -- great software if you can leverage all its parts

Rating: 6 out of 10

Incentivized

August 18, 2025

Use Cases and Deployment Scope

We use Customer.io to send marketing emails and newsletters to our customers and clients. We have a variety of audiences and products with very different needs (some are medical clients, others are healthcare professionals), and we send most of our communications via Customer.io. We do not use it for appointment reminders, as those are integrated in our scheduler.

Pros

Audience Segmentation
Security and User Control
Integrated Campaigns (email, SMS, etc.)
Metrics and Analytics

Cons

Not native SMS features (integrates with Twilio)
Email designer (low/no code version)
Send criteria clarity

Likelihood to Recommend

We have to pay a lot for Customer.io because we need them to sign a BAA with us for HIPAA compliance. It feels like overkill given our small audience and small monthly send rates. We also don't use a lot of the features it has, mostly email. It's pretty good for sending one-off newsletters and campaigns but it's hard to automate recurring things. We also can't leverage a lot of its functionality because we don't have a dedicated developer. If you have access to a dev I think this software is a lot more worth it. It's pretty hard for me to use all the features I want because I work in healthcare.

Verified User

Manager in Marketing (11-50 employees)

Vetted Review

3 years of experience

Customer.io: Great Overall Tool and Great Bank for Buck

Rating: 10 out of 10

Incentivized

January 21, 2025

Use Cases and Deployment Scope

Customer.io is used as a core CRM platform in our business. The tool handles multi layered email, SMS, and other types of marketing channel campaigns for a variety of customer communications. Customer.io also has some advanced features that are used for measuring customer engagement with our campaigns and related analytics.

Pros

Organizing complex comms campaigns
Analytics of campaigns
Textured and detailed emails

Cons

Sales-specific features
Sales pipeline management

Likelihood to Recommend

I think Customer.io is really good if you are looking for primarily a platform to manage comms campaigns to customers. Customer.io is much more cost reasonable than some other big name platforms that have more features out of the box, but not all businesses need those features depending on their stage of development.

Verified User

Professional in Corporate (1001-5000 employees)

Vetted Review

6 years of experience

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