
Your messages will feel more personal when they’re perfectly timed and triggered with an advanced rules-engine.
Create groups of similar people using user profile data or what they’ve done to better inform what you say to them.
Tap into a stream of everything someone has done, and how they’ve interacted with the messages you’ve sent.
Measure your success with opens, clicks, and most importantly: conversions.
Add your own HTML or use ours and use liquid templating to merge in data like {{customer.first_name}}.
Over 900 customers send 100s of millions of messages every month on our enterprise-grade infrastructure.
Features galore, and more being added all the time
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Use an event triggered email to send a payment receipt or other transactional email. Use a segment triggered email to onboard people in your app or win them back after a period of inactivity.
Send or schedule one-time emails to just the right people. No more asking developers to export a CSV just to send out a targeted email.

Customer.io captures on-site and in-app behavior to build profiles of every single sign up.
See how people are using your app. You'll have a view of activity for every person in the system.
View the history of every message sent to a person (and whether or not they opened your emails).
Include the Customer.io Javascript snippet on your site.
We have libraries for most programming languages.
Our friends at Segment.com provide one-click integration to send data to Customer.io.
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