Customer.io Outage History

Customer.io is up right now

Customer.io had 51 outages in the last 2 years totaling 19h 3m of downtime — averaging 2.1 incidents per month.

There were 51 Customer.io outages since August 18, 2025 totaling 19h 3m of downtime. Each is summarised below — incident details, duration, and resolution information.

Source: https://status.customerio.com

Major June 13, 2026

Investigating Connectivity Issues

Detected by Pingoru
Jun 13, 2026, 09:18 PM UTC
Resolved
Jun 14, 2026, 12:00 AM UTC
Duration
2h 41m
Timeline · 4 updates
  1. investigating Jun 13, 2026, 09:18 PM UTC

    We are aware of an issue affecting access to our web application. Customers may encounter ERR_CONNECTION_REFUSED when attempting to access the UI. At this time, we are not aware of any impact beyond UI accessibility. Message processing and delivery continue to operate normally. Our team is actively investigating the issue and working to restore full service as quickly as possible. We will provide updates as more information becomes available.

  2. identified Jun 13, 2026, 10:21 PM UTC

    The team has identified the issue and is actively working on a fix

  3. monitoring Jun 13, 2026, 11:46 PM UTC

    A fix has been implemented and the systems are recovering. We are monitoring UI for any other issue.

  4. resolved Jun 14, 2026, 12:00 AM UTC

    This incident has been resolved.

Read the full incident report →

Minor June 10, 2026

Delays in processing requests

Detected by Pingoru
Jun 10, 2026, 04:45 AM UTC
Resolved
Jun 10, 2026, 05:17 AM UTC
Duration
32m
Affected: Data ProcessingMessage Sending
Timeline · 4 updates
  1. investigating Jun 10, 2026, 04:45 AM UTC

    Our team is aware of an issue affecting Customer IO EU and US systems . We are looking into this and gathering more details.

  2. investigating Jun 10, 2026, 04:56 AM UTC

    Identified the issue, still processing backlog

  3. monitoring Jun 10, 2026, 05:15 AM UTC

    5% of our customers could have experience delays up to 40minutes, but going forward everything is working correctly

  4. resolved Jun 10, 2026, 05:17 AM UTC

    This incident has been resolved.

Read the full incident report →

Notice June 9, 2026

AI Agent and LLM Campaign Actions Disruption

Detected by Pingoru
Jun 09, 2026, 03:49 PM UTC
Resolved
Jun 09, 2026, 04:56 PM UTC
Duration
1h 7m
Timeline · 4 updates
  1. investigating Jun 09, 2026, 03:49 PM UTC

    We are currently investigating an issue affecting our AI Agent and LLM actions within campaigns. Some customers may be experiencing disruption or delays with these features. We will provide an update as soon as we have more information. Thank you for your patience!

  2. identified Jun 09, 2026, 04:33 PM UTC

    Our engineers have identified the issue that is causing disruption. We are working on a resolution and will provide an update shortly. Thank you for your patience.

  3. monitoring Jun 09, 2026, 04:47 PM UTC

    A fix has been implemented and we are monitoring the results.

  4. resolved Jun 09, 2026, 04:56 PM UTC

    This incident has been resolved. Thank you for your patience!

Read the full incident report →

Minor June 5, 2026

Some customers seeing delays setting up Pipelines in new EU workspaces

Detected by Pingoru
Jun 05, 2026, 12:30 PM UTC
Resolved
Jun 05, 2026, 01:35 PM UTC
Duration
1h 4m
Affected: Management Interface
Timeline · 3 updates
  1. investigating Jun 05, 2026, 12:57 PM UTC

    We are currently investigating a delay affecting the setup of Pipelines in newly created workspaces in our EU region. Customers creating new workspaces may experience longer than expected wait times before Pipelines become available. Our team is actively working on this and we will post another update shortly. Thank you for your patience.

  2. monitoring Jun 05, 2026, 01:12 PM UTC

    A fix has been implemented and we are monitoring the results.

  3. resolved Jun 05, 2026, 01:35 PM UTC

    This incident has been resolved.

Read the full incident report →

Minor June 4, 2026

Salesforce and Hubspot syncs might be delayed for some EU customers

Detected by Pingoru
Jun 04, 2026, 11:50 PM UTC
Resolved
Jun 05, 2026, 01:15 AM UTC
Duration
1h 25m
Affected: Data Processing
Timeline · 3 updates
  1. identified Jun 04, 2026, 11:50 PM UTC

    We've identified an issue affecting some EU customers' Salesforce and Hubspot syncs. Our team is working on a fix.

  2. monitoring Jun 05, 2026, 12:44 AM UTC

    We have rolled out a fix and we're monitoring closely.

  3. resolved Jun 05, 2026, 01:15 AM UTC

    We confirm the incident is resolved. Thank you for your patience!

Read the full incident report →

Minor June 4, 2026

Customer.io UI is currently inaccessible

Detected by Pingoru
Jun 04, 2026, 01:34 PM UTC
Resolved
Jun 04, 2026, 01:42 PM UTC
Duration
7m
Affected: Management Interface
Timeline · 3 updates
  1. investigating Jun 04, 2026, 01:34 PM UTC

    Our team is aware of this issue and are digging into it right now. We apologize for the inconvenience and will be back with an update as soon as possible.

  2. monitoring Jun 04, 2026, 01:39 PM UTC

    We've got a fix in place, and the UI is available once again. Thank you for your patience!

  3. resolved Jun 04, 2026, 01:42 PM UTC

    This incident has been resolved.

Read the full incident report →

Major June 2, 2026

UI inaccessible

Detected by Pingoru
Jun 02, 2026, 09:18 PM UTC
Resolved
Jun 02, 2026, 10:57 PM UTC
Duration
1h 39m
Affected: Management Interface
Timeline · 5 updates
  1. investigating Jun 02, 2026, 09:18 PM UTC

    Our team is aware of an issue affecting access to the Customer.io UI. Our team is working to identify the cause.

  2. monitoring Jun 02, 2026, 09:33 PM UTC

    A fix has been deployed for the issue affecting access to the UI. We are monitoring performance and customer feedback.

  3. identified Jun 02, 2026, 10:25 PM UTC

    Our team has identified additional UI-related issues affecting some customers. We are working on a fix now.

  4. monitoring Jun 02, 2026, 10:43 PM UTC

    We have rolled out a fix for the remaining UI-related issues and are watching system behavior closely.

  5. resolved Jun 02, 2026, 10:57 PM UTC

    The issues affecting the UI have been resolved, and the system is functioning normally.

Read the full incident report →

Minor June 1, 2026

Reverse ETL Syncs not being run for some EU Customers

Detected by Pingoru
Jun 01, 2026, 11:40 AM UTC
Resolved
Jun 01, 2026, 12:11 PM UTC
Duration
30m
Affected: Data Processing
Timeline · 3 updates
  1. investigating Jun 01, 2026, 11:40 AM UTC

    We are currently investigating an issue affecting Reverse ETL syncs for some EU customers.

  2. monitoring Jun 01, 2026, 11:44 AM UTC

    A fix has been deployed for the issue affecting Reverse ETL syncs in EU workspaces. We are continuing to monitor this.

  3. resolved Jun 01, 2026, 12:11 PM UTC

    We have confirmed that the incident has been resolved and all Reverse ETL syncs are running as expected. Thanks for your patience!

Read the full incident report →

Minor May 29, 2026

Some customers are seeing broadcast delivery delays (emails, push notifications, and webhooks)

Detected by Pingoru
May 29, 2026, 04:26 PM UTC
Resolved
May 29, 2026, 05:08 PM UTC
Duration
41m
Affected: Message Sending
Timeline · 4 updates
  1. investigating May 29, 2026, 04:26 PM UTC

    Our engineers are aware of an issue where messages may be showing as "queued". We're investigating this now. Thank you for your patience!

  2. identified May 29, 2026, 04:40 PM UTC

    We've identified the issue and are working towards a resolution now.

  3. monitoring May 29, 2026, 04:51 PM UTC

    We have a resolution in place and are monitoring message throughput recovery now. Thank you for your patience!

  4. resolved May 29, 2026, 05:08 PM UTC

    We have confirmed that this incident is now resolved. Thank you very much for your patience!

Read the full incident report →

Minor May 25, 2026

Customers in the EU region may experience delays in message sending

Detected by Pingoru
May 25, 2026, 03:27 PM UTC
Resolved
May 25, 2026, 04:10 PM UTC
Duration
42m
Affected: Message Sending
Timeline · 3 updates
  1. investigating May 25, 2026, 03:27 PM UTC

    We are currently investigating this issue.

  2. monitoring May 25, 2026, 03:58 PM UTC

    A fix has been implemented and we are monitoring the results.

  3. resolved May 25, 2026, 04:10 PM UTC

    This incident has been resolved.

Read the full incident report →

Minor May 6, 2026

Some customers in our EU region may experience errors and delays

Detected by Pingoru
May 06, 2026, 04:00 PM UTC
Resolved
May 06, 2026, 04:26 PM UTC
Duration
25m
Affected: Data CollectionData ProcessingMessage SendingManagement Interface
Timeline · 3 updates
  1. identified May 06, 2026, 04:00 PM UTC

    Our engineers are looking into an issue where some workspaces aren't loading as expected. Processing and deliveries may be delayed. We're working to get this resolved and will post an update soon. Thank you for your patience!

  2. monitoring May 06, 2026, 04:14 PM UTC

    The UI is available as expected, and we are monitoring before marking this as fully resolved. Thank you again for your patience!

  3. resolved May 06, 2026, 04:26 PM UTC

    This incident has been resolved.

Read the full incident report →

Major April 20, 2026

Delay in Salesforce & Hubspot data-in integrations

Detected by Pingoru
Apr 20, 2026, 07:52 PM UTC
Resolved
Apr 20, 2026, 08:06 PM UTC
Duration
14m
Affected: Data Processing
Timeline · 3 updates
  1. investigating Apr 20, 2026, 07:52 PM UTC

    We are currently investigating an issue impacting Salesforce and Hubspot data-in integrations in the US region.

  2. monitoring Apr 20, 2026, 08:04 PM UTC

    We have identified the issue, released a fix, and are currently monitoring integrations.

  3. resolved Apr 20, 2026, 08:06 PM UTC

    This incident has been resolved.

Read the full incident report →

Minor April 20, 2026

Customer.io UI is currently unavailable for some customers

Detected by Pingoru
Apr 20, 2026, 04:45 PM UTC
Resolved
Apr 20, 2026, 04:55 PM UTC
Duration
10m
Affected: Management Interface
Timeline · 3 updates
  1. investigating Apr 20, 2026, 04:55 PM UTC

    Our engineers are looking into an issue where some workspaces aren't loading as expected. We're working to get this resolved and will post an update soon. Thank you for your patience!

  2. monitoring Apr 20, 2026, 05:03 PM UTC

    The UI is available as expected, and we are monitoring before marking this as fully resolved. Thank you again for your patience!

  3. resolved Apr 20, 2026, 05:35 PM UTC

    This incident is now resolved. Thank you for your patience and understanding!

Read the full incident report →

Notice April 16, 2026

Customer.io UI currently experiencing issues

Detected by Pingoru
Apr 16, 2026, 09:30 PM UTC
Resolved
Apr 16, 2026, 09:30 PM UTC
Duration
—
Timeline · 1 update
  1. resolved Apr 16, 2026, 09:17 PM UTC

    Customers who are currently working in our UI are likely to have seen elevated errors or loading. Our engineers are aware, investigated, and have resolved this issue. Thank you for your patience and understanding!

Read the full incident report →

Notice April 15, 2026

Unable to create event-driven campaigns

Detected by Pingoru
Apr 15, 2026, 09:06 PM UTC
Resolved
Apr 15, 2026, 08:30 PM UTC
Duration
—
Timeline · 1 update
  1. resolved Apr 15, 2026, 09:06 PM UTC

    We've identified an issue that was preventing the workflow builder from adding Event campaign triggers. This did not affect processing or deliveries for existing campaigns, only the workflow UI experience was impacted. This incident has already been resolved.

Read the full incident report →

Major April 13, 2026

Integration Destinations UI Disruption

Detected by Pingoru
Apr 13, 2026, 06:26 PM UTC
Resolved
Apr 13, 2026, 06:31 PM UTC
Duration
5m
Affected: Management Interface
Timeline · 3 updates
  1. investigating Apr 13, 2026, 06:26 PM UTC

    Our team is aware of an issue affecting Integrations with destinations in EU/US. We are looking into this and gathering more details. Data import and export is still working, only the UI is effected.

  2. identified Apr 13, 2026, 06:28 PM UTC

    The issue has been identified in the UI and a fix is being deployed.

  3. resolved Apr 13, 2026, 06:31 PM UTC

    A fix has been deployed and the system's functionality is fully restored.

Read the full incident report →

Minor April 7, 2026

EU Region API Processing Delays

Detected by Pingoru
Apr 07, 2026, 04:46 PM UTC
Resolved
Apr 07, 2026, 08:53 PM UTC
Duration
4h 7m
Affected: Data Processing
Timeline · 3 updates
  1. investigating Apr 07, 2026, 04:46 PM UTC

    Some customers in our EU region may be experiencing delays with processing data sent in through our API. Our team is investigating the cause and will provide an update soon. Thank you for your patience!

  2. investigating Apr 07, 2026, 05:26 PM UTC

    We are continuing to investigate this and will be back again as soon as we have an update. Thank you for your continued patience!

  3. resolved Apr 07, 2026, 08:53 PM UTC

    Our engineers have identified the issue and have deployed a resolution. Processing delays are clearing up. Thank you very much for your patience!

Read the full incident report →

Notice March 18, 2026

UI Errors Identified

Detected by Pingoru
Mar 18, 2026, 07:09 PM UTC
Resolved
Mar 18, 2026, 07:09 PM UTC
Duration
—
Affected: Management Interface
Timeline · 1 update
  1. resolved Mar 18, 2026, 07:09 PM UTC

    Our team identified and resolved errors impacting creating and saving campaigns, newsletters, segments in the user interface.

Read the full incident report →

Minor March 16, 2026

Domain Verification Currently Unavailable

Detected by Pingoru
Mar 16, 2026, 09:30 AM UTC
Resolved
Mar 16, 2026, 09:55 AM UTC
Duration
25m
Affected: Management Interface
Timeline · 4 updates
  1. investigating Mar 16, 2026, 09:30 AM UTC

    Customers are unable to add or edit unverified sending domains.

  2. identified Mar 16, 2026, 09:38 AM UTC

    The issue has been identified and a fix is being implemented.

  3. monitoring Mar 16, 2026, 09:48 AM UTC

    A fix has been implemented and we are monitoring the results.

  4. resolved Mar 16, 2026, 09:55 AM UTC

    The issue has been resolved.

Read the full incident report →

Minor February 23, 2026

Some customers in our US region may experience errors and delays

Detected by Pingoru
Feb 23, 2026, 08:11 PM UTC
Resolved
Feb 23, 2026, 08:42 PM UTC
Duration
31m
Affected: Data ProcessingMessage Sending
Timeline · 3 updates
  1. identified Feb 23, 2026, 08:11 PM UTC

    We're currently investigating an issue that may be impacting some US-based customers, potentially causing UI errors along with delays in processing and message delivery. We appreciate your patience as our team works to get this resolved.

  2. monitoring Feb 23, 2026, 08:28 PM UTC

    A fix has been implemented and we're continuing to monitor for stability. Thank you for your patience!

  3. resolved Feb 23, 2026, 08:42 PM UTC

    This incident has been resolved. We greatly appreciate your patience!

Read the full incident report →

Notice February 13, 2026

Reverse ETL syncs may experience delays in US

Detected by Pingoru
Feb 13, 2026, 10:42 PM UTC
Resolved
Feb 13, 2026, 11:02 PM UTC
Duration
20m
Timeline · 3 updates
  1. identified Feb 13, 2026, 10:42 PM UTC

    A subset of customers in US may experience delays on completing reverse ETL syncs.

  2. monitoring Feb 13, 2026, 10:51 PM UTC

    A fix has been implemented and we are monitoring.

  3. resolved Feb 13, 2026, 11:02 PM UTC

    This incident has been resolved.

Read the full incident report →

Minor January 28, 2026

Some customers are experiencing delays with message sending

Detected by Pingoru
Jan 28, 2026, 06:56 PM UTC
Resolved
Jan 28, 2026, 07:26 PM UTC
Duration
29m
Affected: Message Sending
Timeline · 3 updates
  1. investigating Jan 28, 2026, 06:56 PM UTC

    Our engineers are currently investigating an issue where message sending is delayed. We thank you for your patience and will be back with another update as soon as possible.

  2. monitoring Jan 28, 2026, 07:22 PM UTC

    A fix has been implemented and we are monitoring the results.

  3. resolved Jan 28, 2026, 07:26 PM UTC

    This issue is now resolved. We greatly appreciate your patience while we investigated.

Read the full incident report →

Notice January 21, 2026

Issue with downloading exports from our App API

Detected by Pingoru
Jan 21, 2026, 08:45 PM UTC
Resolved
Jan 21, 2026, 08:55 PM UTC
Duration
10m
Timeline · 2 updates
  1. identified Jan 21, 2026, 08:45 PM UTC

    Our team is aware of and has identified an issue that is causing our App API to return a 500 error when attempting to download custom exports. We're working on getting a resolution in place, and appreciate your patience.

  2. resolved Jan 21, 2026, 08:55 PM UTC

    This incident has been resolved.

Read the full incident report →

Notice January 14, 2026

Delays with Salesforce Syncs

Detected by Pingoru
Jan 14, 2026, 04:34 PM UTC
Resolved
Jan 14, 2026, 04:34 PM UTC
Duration
—
Affected: Data Processing
Timeline · 1 update
  1. resolved Jan 14, 2026, 04:34 PM UTC

    Between 16:00 UTC January 13th and 08:00 UTC January 14th our team was alerted to an issue causing long delays completing Salesforce syncs. The issue has now been resolved and we are continuing to monitor.

Read the full incident report →

Minor December 13, 2025

Customers may be impacted by data delays

Detected by Pingoru
Dec 13, 2025, 12:06 PM UTC
Resolved
Dec 13, 2025, 01:37 PM UTC
Duration
1h 30m
Affected: Data Processing
Timeline · 4 updates
  1. investigating Dec 13, 2025, 12:06 PM UTC

    We identified a recent change that might cause data delays for some customers in the US. We are currently investigating.

  2. investigating Dec 13, 2025, 12:33 PM UTC

    We are continuing to investigate this issue.

  3. monitoring Dec 13, 2025, 01:03 PM UTC

    A fix has been implemented and we are monitoring the results.

  4. resolved Dec 13, 2025, 01:37 PM UTC

    This incident has been resolved.

Read the full incident report →