Features
Build and test your most creative messaging flows
Customer.io provides a blank canvas for you to design and implement your business’s unique messaging strategy.
DATA & INTEGRATIONS
Flexible data integrations that fit your business needs
Customer.io provides multiple ways to get real-time business data from your product into our platform to power all of your automated messaging and keep your user database up-to-date.
Direct Integration
Our RESTful API allows you to create, update, and delete people. You can also send event data from your application to Customer.io in multiple library languages (including Ruby, Python, Go, and more).
Upload user data as a CSV file, sync data from a SQL database with our Reverse ETL, or manually add new people through the UI to start sending messages even faster.
Dive into the API 
Third-Party Integration
If you’re already using Segment , mParticle , Hull , or RudderStack your integration can be completed in just a few clicks! Customer.io also supports data coming in from Zapier and adds new third-party integrations all the time.
Explore our integrations
SEGMENTATION
Narrow down your audience
Customer.io’s segmentation engine is built for speed and flexibility. Segments are calculated in real-time and performance scales with your business. With no limits on segmentation, you can be incredibly specific with whom you target.
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Group people by…
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Personal attributes
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Pages they view
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What they do in your product
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Anything else that you send with Customer.io
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Use segments for…
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Recipient lists
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Campaign triggers
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Filters
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Conversion goals
See individual profile data
Sometimes you need to isolate a specific person or a set of people by attributes. Easily view a full log of event and attribute data, where users are engaging, what messages they have received, and more.
Turn Segments into Ad Audiences
Start saving time and money by syncing your Customer.io segments to your ad network of choice. Retargeting the right users and showing the best ads to your most valued customers is seamless with Customer.io.
Learn how to save time
MESSAGING
Spend more time on strategy and less on building
Our rules-based visual workflow builder gives you the control you’ve longed for and the power needed to define your optimal user experience.
Explore the workflow builder
A Transactional API built for you
Built for speed, deliverability, and reliability. Our Transactional API offers the flexibility to apply your existing layouts and styles in Customer.io to your transactional messages. Consistent branding is essential across all your messages, not just marketing emails.
Level up your transactional messages
Mobile made easy
Enhance your cross-channel strategy with mobile
Send more personalized messages with Collections
You have the tools to target the right users with Customer.io. Take it one step further and use Collections to include specific information about your business and tailor it for each individual person. Importing your Collection data is easy. Upload a CSV, Google Sheet, or use our API.
Learn how to use your business data
Connect with Customers through Newsletters
Make every announcement count. Use Customer.io to send multichannel newsletters within the user’s time zone to make sure your Terms of Service update or new feature brief lands at the top of the inbox.
METRICS & ANALYSIS
Real-time data you can rely on
Move beyond opens and clicks to measure the success of your campaigns. Deep dive into the number of conversions and the amount of revenue they drive by filtering, viewing, and comparing metrics across all of your workspaces.
Dashboard view
Stay on top of your messaging health. Monitor your message leaderboard, segment membership, active A/B tests, and delivery metrics to identify spikes or trends over time.
Export your data
Connect your Customer.io data and your internal reporting via CSV exports or send the data directly to your data warehouse of choice without accruing additional costs or headaches.
Analysis Reports
Compare campaigns, newsletters, and API-Triggered Broadcasts metrics across your entire workspace in seconds. Shake things up and define reports by name, tags, channel type, or specific time ranges.
EXPERIMENTATION
Test your hypothesis, optimize your strategy
Turn every idea into a test. Whether it’s a single piece of a message or an entire flow, put it into action. Experiment with campaign subject lines, message content, delivery time, and more. Keep track of all the running a/b tests right from the dashboard.
Best-in-class technical support when you need it
With a 99% CSAT score, our support team ensures the highest level of success. Every customer has access to email support and will hear back within 24-hours.