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There are three major ways to send messages in Customer.io. Watch this video to learn when to run a campaign, send a broadcast, or trigger a transactional message

Choose your path: campaigns, broadcasts, & transactional messages

People and events are your data in Customer.io.

Understand your data: people and events

Integrate with our client-side JavaScript integration in just a few minutes, to bring data into Customer.io *and* send your audience in-app messages.

Integrate with our JavaScript client

Get StartedGet Started

Platform overview

Learn the basics of Customer.io.

Quick start guide

How to get up and running ASAP.

People

Integrate, import, or manually add people to your workspace.

Segments

Group people based on their attributes or behaviors.

Objects

Relate people to non-people data.

Events

Track customer behavior.

Send a newsletter

Broadcast a message to a group of customers.

Create a campaign

Craft an automated workflow to send people messages and perform other actions.

Metrics

Track the performance of your marketing efforts.

Message channelsMessage channels

Email

Send email messages.

In-app

Send web or in-app messages.

Push

Send push notifications.

Webhooks

Send and receive data with webhooks.

SMS

Natively send SMS with Twilio.

Slack

Send messages and notifications to Slack.

For developersFor developers

Integration guide

Learn how to send data in and out of Customer.io.

API reference

Integrate your data.

SDKs

Integrate your mobile app.

Reporting webhooks

Send metrics to a third-party service.