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Customer.io Outage History

Every past Customer.io outage tracked by IsDown, with detection times, duration, and resolution details.

There were 245 Customer.io outages since June 2017. The 63 outages from the last 12 months are summarized below, with incident details, duration, and resolution information.

Minor May 6, 2026

May 2026: Some customers in our EU region may experience errors and delays

Detected May 6, 2026 12:00 PM EDT · Resolved May 6, 2026 12:29 PM EDT · Duration 29 minutes

Customer.io experienced a 29-minute incident in their EU region where some workspaces failed to load properly, causing delays in data processing and deliveries. The issue affected the Data Collection, Data Processing, and Management Interface components. Engineers identified and resolved the problem, restoring normal UI functionality and service operations.

Major April 20, 2026

April 2026: Delay in Salesforce & Hubspot data-in integrations

Detected Apr 20, 2026 3:52 PM EDT · Resolved Apr 20, 2026 4:07 PM EDT · Duration 15 minutes

Customer.io experienced a major incident affecting Salesforce and Hubspot data-in integrations in the US region, impacting data processing capabilities. The issue caused delays in data synchronization from these CRM platforms into Customer.io. The incident was resolved after 15 minutes of investigation and remediation.

Minor April 20, 2026

April 2026: Customer.io UI is currently unavailable for some customers

Detected Apr 20, 2026 12:50 PM EDT · Resolved Apr 20, 2026 1:38 PM EDT · Duration about 1 hour

Customer.io experienced a UI availability issue where some workspaces failed to load properly, affecting the management interface for certain customers. The incident lasted 49 minutes while engineers investigated and resolved the loading problems. The service was restored and monitored before being marked as fully resolved.

Minor April 17, 2026

April 2026: Some customers in our EU region may experience errors and delays

Detected Apr 17, 2026 4:07 PM EDT · Resolved Apr 17, 2026 4:18 PM EDT · Duration 11 minutes

Customer.io experienced errors and delays affecting customers in the EU region for 11 minutes. The incident impacted the Management Interface, Data Collection, and Data Processing components. The issue was quickly identified and resolved with a fix implementation.

Major April 13, 2026

April 2026: Integration Destinations UI Disruption

Detected Apr 13, 2026 2:26 PM EDT · Resolved Apr 13, 2026 2:32 PM EDT · Duration 6 minutes

Customer.io experienced a major disruption affecting the Integrations with destinations UI for both EU and US regions, preventing users from accessing the management interface for integration configurations. Data import and export functionality remained operational throughout the incident, with only the user interface being impacted. The issue was resolved within 6 minutes after a fix was deployed, fully restoring system functionality.

Minor April 7, 2026

April 2026: EU Region API Processing Delays

Detected Apr 7, 2026 12:46 PM EDT · Resolved Apr 7, 2026 4:53 PM EDT · Duration about 4 hours

Customer.io experienced API processing delays in their EU region that affected data processing for some customers over 4.1 hours. The engineering team identified the root cause and deployed a fix, resolving the processing delays.

Minor March 16, 2026

March 2026: Domain Verification Currently Unavailable

Detected Mar 16, 2026 5:30 AM EDT · Resolved Mar 16, 2026 5:57 AM EDT · Duration 27 minutes

Customer.io experienced a 27-minute outage where customers were unable to add or edit unverified sending domains through the Management Interface. The issue was identified, fixed, and resolved after a brief monitoring period.

Minor February 23, 2026

February 2026: Some customers in our US region may experience errors and delays

Detected Feb 23, 2026 3:11 PM EST · Resolved Feb 23, 2026 3:44 PM EST · Duration 33 minutes

Customer.io experienced a service incident affecting US-based customers for 33 minutes, causing UI errors and delays in data processing and message delivery. The team implemented a fix and monitored the system for stability before confirming full resolution of the issue.