Customer.io Release Notes

MESSAGING

MOBILE SDK

You can now trigger workflows when a person enters or exits a physical location, like a store, a parking lot, a venue, and engage them across any of your message channels. Geofencing helps you send timely, location-aware messages without building custom location logic or relying on a third-party geofencing integration.

Geofences are available on Premium and Enterprise plans. You can trigger automations, group people into segments, and add geofence conditions to wait actions in automations. You can track when people enter or exit a geofence in their activity logs.

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AI

MESSAGING

UI IMPROVEMENTS

You can now attach a file, a Google Drive doc, or query recent events as a knowledge source and reuse it across LLM actions, instead of pasting the same text into every prompt. Reference the knowledge source name in the prompt to tell the LLM how to use it.

Save any source to the workspace-scoped Knowledge Library and attach it to one or more actions.

Knowledge sources are also available to the Agent if you want to use them as context for other requests.

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MESSAGING

You can now set up channel-based message limits for email, SMS, push notifications, and webhooks. Historically, you could only set a single message limit across your message channels.

You can add per-channel or shared message limits to ensure your audience receives the right number of messages in a specific time frame. With this release, you can also set a wider time frame for your message limit. Instead of 7 days, your message limit can be up to 31 days.

You can limit the number of WhatsApp and SMS messages sent via Twilio, but not other vendors.

UI IMPROVEMENTS

We’ve updated some navigation labels to better match how people think about marketing automation and messaging their audience: Campaigns are now Automations, People are Profiles, and Newsletters are One-time sends.

Here’s what changed:

You used to see You’ll now see
Campaigns Automations
People Profiles
Broadcasts > Newsletters Broadcasts > One-time sends
Analysis Reports
Deliveries & drafts Message activity (with Sent and Drafts tabs)
Activity logs Profile activity

APIs and data don’t change. Endpoints, field names, and identifiers keep their names. What we now call an automation is still a campaign in the API, and a one-time send is still a newsletter. Any links you’ve bookmarked will still work; we redirect the old paths to the new ones automatically—both in the app and in our documentation.

MESSAGING

UI IMPROVEMENTS

The new Email clients tab in the Analysis section breaks down opens and clicks by email client. This information tells you which clients you should focus on when designing emails, and how privacy proxies affect your open rates.

The Email clients tab shows each client’s share of your opens, human opens, and clicks, with charts for your overall client mix and how it changes day by day. Email client data is available from April 15, 2025 onward.

The Deliverability tab now also shows a daily send volume chart with bounce and spam complaint rates.

This feature is available to premium and enterprise accounts with access to deliverability analytics.

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UI IMPROVEMENTS

If you have multiple Customer.io accounts, you no longer need a separate login for each one. With guest access, you can sign in to your own account and switch to any account that added you as a guest. If you maintained multiple accounts yourself, you can merge them into a single login.

With guest access, you have:

• One login for all your accounts: You sign in to your main login, and you’ll see all the accounts you can access. No more inventing a new email address and password for every account.
• Invite guests like team members: As an admin, you can invite guests to your account.
• Permissions stay per account: Guests only get the permissions you decide to grant them, and everything they do is recorded in that account’s audit log.
• Partners can create client accounts: If you’re a partner, you can create client accounts and see them all in one place from the new Partner Settings page.

Go to the docs