Customer.io Outage History

69 incidents recorded over the last 365 days, 69 of them resolved. Durations are measured from when PulsAPI first saw the problem to when it cleared, which is usually longer than the vendor's own figure.

Live Customer.io status99.37% uptime history

Every Recorded Customer.io Incident

Customer.io incidents, newest first, with date, duration and status.
DateIncidentDurationStatus
Aug 5, 2026Customer.io UI is inaccessibleThis incident has been resolved.26 minResolved
Aug 3, 2026Delays in processing and UI inaccessible for some customers in the US datacentreThis incident has been resolved. Thanks for your patience.33 minResolved
Jul 31, 2026Issues accessing EU accountsThis incident is resolved.15 minResolved
Jul 23, 2026Some EU users are experiencing delays in processingThis incident has been resolved. Thanks a lot for your patience while we worked on a fix here.1h 37mResolved
Jul 20, 2026Some customers are experiencing data processing and message-sending delaysThis incident has been resolved and all backlogs have been processed.1h 22mResolved
Jul 20, 2026Delays in message sendingThis incident has been resolved.40 minResolved
Jul 15, 2026Some customers are experiencing data processing delaysThis incident is resolved. Thank you for your patience!2h 26mResolved
Jul 10, 2026Delays processing send events in some environmentsThis incident has been resolved and any delays have been fully mitigated.40 minResolved
Jul 3, 2026User Interface is currently unavailable for some users in EU. Data processing delaysThis incident has been resolved. The Customer.io UI is available, and data processing has recovered to normal operating levels. We will continue internal follow-up and remediation work. Thank you for your patience.2h 2mResolved
Jul 2, 2026User Interface is currently unavailable, data processing delaysThis incident has been resolved.24 minResolved
Jun 18, 2026Some customers are currently unable to access the account Billing page in our UIThis incident has been resolved.28 minResolved
Jun 13, 2026Investigating Connectivity IssuesThis incident has been resolved.2h 41mResolved
Jun 10, 2026Delays in processing requestsThis incident has been resolved.32 minResolved
Jun 9, 2026AI Agent and LLM Campaign Actions DisruptionThis incident has been resolved. Thank you for your patience!1h 7mResolved
Jun 5, 2026Some customers seeing delays setting up Pipelines in new EU workspacesThis incident has been resolved.1h 4mResolved
Jun 4, 2026Salesforce and Hubspot syncs might be delayed for some EU customersWe confirm the incident is resolved. Thank you for your patience!1h 25mResolved
Jun 4, 2026Customer.io UI is currently inaccessibleThis incident has been resolved.7 minResolved
Jun 2, 2026UI inaccessibleThe issues affecting the UI have been resolved, and the system is functioning normally.1h 39mResolved
Jun 1, 2026Reverse ETL Syncs not being run for some EU CustomersWe have confirmed that the incident has been resolved and all Reverse ETL syncs are running as expected. Thanks for your patience!30 minResolved
May 29, 2026Some customers are seeing broadcast delivery delays (emails, push notifications, and webhooks)We have confirmed that this incident is now resolved. Thank you very much for your patience!41 minResolved
May 25, 2026Customers in the EU region may experience delays in message sendingThis incident has been resolved.42 minResolved
May 6, 2026Some customers in our EU region may experience errors and delaysThis incident has been resolved.25 minResolved
Apr 20, 2026Delay in Salesforce & Hubspot data-in integrationsThis incident has been resolved.14 minResolved
Apr 20, 2026Customer.io UI is currently unavailable for some customersThis incident is now resolved. Thank you for your patience and understanding!0 minResolved
Apr 17, 2026Some customers in our EU region may experience errors and delaysThis incident has been resolved.8 minResolved
Apr 16, 2026Customer.io UI currently experiencing issuesCustomers 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!12 minResolved
Apr 15, 2026Unable to create event-driven campaignsWe'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…-36 minResolved
Apr 13, 2026Integration Destinations UI DisruptionA fix has been deployed and the system's functionality is fully restored.5 minResolved
Apr 7, 2026EU Region API Processing DelaysOur engineers have identified the issue and have deployed a resolution. Processing delays are clearing up. Thank you very much for your patience!4h 7mResolved
Mar 26, 2026Some customers in our EU region may experience errors and delaysSome customers in the EU region may have seen errors in the UI and delays of up to 10 minutes in deliveries and data processing.-34 minResolved
Mar 18, 2026UI Errors IdentifiedOur team identified and resolved errors impacting creating and saving campaigns, newsletters, segments in the user interface.0 minResolved
Mar 16, 2026Domain Verification Currently UnavailableThe issue has been resolved.25 minResolved
Feb 23, 2026Some customers in our US region may experience errors and delaysThis incident has been resolved. We greatly appreciate your patience!31 minResolved
Feb 19, 2026Some customers in our EU region may experience errors and delaysOur engineers have resolved this issue. Thank you very much for your patience!8 minResolved
Feb 13, 2026Reverse ETL syncs may experience delays in USThis incident has been resolved.20 minResolved
Jan 28, 2026Some customers are experiencing delays with message sendingThis issue is now resolved. We greatly appreciate your patience while we investigated.29 minResolved
Jan 21, 2026Issue with downloading exports from our App APIThis incident has been resolved.10 minResolved
Jan 14, 2026Delays with Salesforce SyncsBetween 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.0 minResolved
Dec 13, 2025Customers may be impacted by data delaysThis incident has been resolved.1h 30mResolved
Dec 12, 2025Some customers are experiencing issues with saving their contentThis incident has been resolved.18 minResolved
Dec 9, 2025Intermittent issues loading the in-app message editor.The team has identified the issue and released a fix.40 minResolved
Dec 8, 2025Customers may be impacted by data delays`Incident Summary ` `On December 8th, 2025, beginning at 17:38 UTC, some customers experienced delays in data processing and message delivery. Normal functionality was fully restored at 18:19 UTC, for a total duration…2h 6mResolved
Nov 24, 2025Trouble loading User Interface in some workspaceThe team has released a fix and this incident is now resolved.54 minResolved
Nov 24, 2025US infrastructure delays with a subset of deliveries sending**Duration:** 2h 14m, Nov 24 8:08 AM UTC - 10:22 AM UTC\] **Severity:** P2 **Impact:** Reduced message processing rates across US infrastructure ### What Happened On November 24th, our message rendering service…36 minResolved
Nov 21, 2025Forms submissions experiencing intermittent delaysThe issue has now been resolved.1h 22mResolved
Nov 18, 2025Legacy in-app editing, delays receiving in-app messages and Journeys domain verification with CloudflareThis incident has been resolved.2h 22mResolved
Nov 5, 2025Code Editor is freezing unexpectedlyThe issue has now been resolved.20 minResolved
Nov 4, 2025Some workspaces experiencing delays in campaign journeys and deliveries in US Data Center# **Incident Summary** On November 4, 2025, between 20:10 UTC and 21:54 UTC, some customers with our US data center may have experienced delays in message sending. This issue did not affect data ingestion and no data…1h 7mResolved
Oct 31, 2025Issue preventing some workspaces from loading in the USThis incident has been resolved.23 minResolved
Oct 30, 2025Some US customers may be impacted by data delays and UI errors# **Incident Summary** On October 30th, 2025, between 17:12 UTC and 22:10 UTC, some customers with our US data center may have experienced delays in data processing, message sending and user interface errors. This…4h 32mResolved
Oct 29, 2025Delayed Workspace PerformanceThis incident has been resolved.9 minResolved
Oct 29, 2025Integrations pages are currently not loadingThe team has implemented a fix and this incident has now been resolved.13 minResolved
Oct 29, 2025Intermittent loading issues in the Customer.io UIThis incident has been resolved.48 minResolved
Oct 23, 2025Delayed Workspace Performance**Incident Summary** On October 23rd, 2025, between 20:36 UTC and 23:31 UTC customers in both the US and EU regions may have experienced delays in data processing, message sending and user interface sending state…1h 34mResolved
Oct 21, 2025Intermittent issues loading Design Studio for some of our EU customersThis issue has now been resolved.1h 14mResolved
Oct 20, 2025Twilio Templates OutageThis incident has been resolved.3h 21mResolved
Oct 20, 2025Customer.io Documentation website (https://docs.customer.io) may not be loading for some customersThis incident has been resolved.19h 33mResolved
Oct 8, 2025Issue with Design StudioThis incident has been resolved.29 minResolved
Oct 6, 2025Some US customers may be impacted by data delays and UI errorsThis incident has been resolved.29 minResolved
Sep 30, 2025Some customers in the US are experiencing delaysThis incident has been resolved.9 minResolved
Sep 26, 2025Some customers in our EU region are experiencing delaysThis incident has been resolved.31 minResolved
Sep 26, 2025Some customers in our EU region are experiencing delaysThis incident has been resolved.45 minResolved
Sep 16, 2025Some customers in our EU region are experiencing delaysOur engineers identified that some customers with accounts in our EU may have experienced delays with data processing and message sending, as well as UI errors. We've identified the issue and it was resolved by ~11:20…-40 minResolved
Sep 13, 2025Some customers in our US region are experiencing delaysThis incident has been resolved.26 minResolved
Sep 13, 2025Some customers in our US region are experiencing delaysThis incident has been resolved.5 minResolved
Sep 12, 2025Some customers in our US region are experiencing delaysThis incident has been resolved.15 minResolved
Aug 28, 2025Some customers are experiencing delays with import processingThis incident has been resolved.54 minResolved
Aug 28, 2025Some Data Warehouse Sync Exports are unexpectedly failing.The issue has been resolved. Data Warehouse Sync exports are back fully operational.1h 14mResolved
Aug 24, 2025US Customers using mobile sdk, javascript calls, and cdp api may experience errors with calls to the api.This incident has been resolved.1h 8mResolved

How to Read This Customer.io Incident Log

Each row is an incident PulsAPI observed, not a summary written afterwards. The duration is wall-clock time between the first failing check and the first clean one, so it includes the window before Customer.io acknowledged anything. Vendor post-mortems typically measure from acknowledgement, which is why their numbers are usually shorter.

Incidents still open have no duration yet and are listed as ongoing rather than being given a running total. The archive covers the last 365 days; anything older has aged out of the window rather than never having happened.

The longest single Customer.io outage in this window ran 19h 33m, against a mean recovery of 1h 11m. If you depend on Customer.io in a customer-facing path, the longest figure is the one to design around. The mean is what happens on a normal bad day; the maximum is what happens on the worst one.