transactional messages

Simplify transactional messaging

Trigger password resets, order receipts, and more all from the same platform you send lifecycle messages.

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Trusted by 9,000+ brands

transactional messages

Simplify transactional messaging

Trigger password resets, order receipts, and more all from the same platform you send lifecycle messages.

Form not working? Click here to get your referral link

Trusted by 9,000+ brands

transactional messages

Simplify transactional messaging

Trigger password resets, order receipts, and more all from the same platform you send lifecycle messages.

Form not working? Click here to get your referral link

Trusted by 9,000+ brands

We unify your data, messaging, and AI into a single platform, so every interaction with your customers is stronger and more relevant than the last.

Send critical messages instantly

Deliver receipts, password resets, and alerts the moment users need them.

Trigger programmatically

Send messages using our Transactional API with full control over content and timing.

Reach users across channels

Deliver transactional messages via email, and SMS wherever your users are.

We unify your data, messaging, and AI into a single platform, so every interaction with your customers is stronger and more relevant than the last.

Send critical messages instantly

Deliver receipts, password resets, and alerts the moment users need them.

Trigger programmatically

Send messages using our Transactional API with full control over content and timing.

Reach users across channels

Deliver transactional messages via email, and SMS wherever your users are.

We unify your data, messaging, and AI into a single platform, so every interaction with your customers is stronger and more relevant than the last.

Send critical messages instantly

Deliver receipts, password resets, and alerts the moment users need them.

Trigger programmatically

Send messages using our Transactional API with full control over content and timing.

Reach users across channels

Deliver transactional messages via email, and SMS wherever your users are.

Reliable Messaging

Deliver critical messages instantly and at scale

Reliable Messaging

Deliver critical messages instantly and at scale

Reliable Messaging

Deliver critical messages instantly and at scale

Real-time messaging

Trigger messages the moment they’re needed

Respond to user actions like purchases, logins, or requests with immediate, expected messages, no delays or workflows required.

Real-time messaging

Trigger messages the moment they’re needed

Respond to user actions like purchases, logins, or requests with immediate, expected messages, no delays or workflows required.

Control

Build and send with full API flexibility

Use the transactional API to send messages programmatically, pass dynamic data, and control every aspect of delivery.

Control

Build and send with full API flexibility

Use the transactional API to send messages programmatically, pass dynamic data, and control every aspect of delivery.

Deliver

Ensure deliverability

Send through infrastructure designed for transactional use cases, helping important messages reach inboxes reliably.

Deliver

Ensure deliverability

Send through infrastructure designed for transactional use cases, helping important messages reach inboxes reliably.

Customers love us

Preferred by product-led companies

Mailchimp was so difficult to integrate and required so much manual work. The implementation was so easy with Customer.io, the automatic setup and integration. With a click of a button, we were able to immediately start sending campaigns to our users. Plus they didn’t have the workflows Customer.io does.

Ben Spring

Co-Founder

At the end of the day, we’re trying to deliver exactly what the customer wants. By using event conversions and segments, we’re giving them what they need and what they expect to get.

Matt Hayes

Email Marketing Manager

Using Customer.io has boosted our numbers in every imaginable way—from audience growth to engagement to conversion. They are literally helping us change lives around with world.

Grace Garey

Co-Founder