Klaviyo Outage History

A fix has been deployed and system performance is improving. Intermittent errors, slow page loads, and delays for email and SMS sends are recovering. We continue to monitor closely.

Analytics processing for campaigns and flows is recovering and the delay is decreasing. Sending, scheduling, and other core functions remain fully operational. We're monitoring closely and will confirm once analytics return to normal operation.

Segmentation has been restored to real-time processing, and campaign and forms analytics have now recovered. This was a reporting UI display issue only, no data was lost. Our engineering team continues to monitor closely until our upstream service provider has confirmed full recovery.

We successfully implemented a fix as of 3:20 AM US/Eastern that restored all API activity. We are continuing to monitor the results.

Mar 27, 01:15 EDT Resolved - Real-time segmentation is processing in real-time, and this incident has been resolved. Mar 27, 00:46 EDT Monitoring - Starting around 8:15 PM US Eastern 26th March, we began seeing delays in real-time segment processing for a subset of customers. Segments may be out of date by up to 2.5 hours. Engineering have identified a solution and are working to implement the fix shortly. We will continue to provide updates as real-time segmentation functionality is restored.

Jan 12, 07:23 EST Resolved - This incident has been resolved. Jan 12, 07:05 EST Monitoring - A fix has been implemented and we are monitoring results. Campaign sending and scheduling is back to normal, and all delayed campaigns have been replayed. Jan 12, 06:51 EST Identified - As of 6:45am US Eastern, the issue has been identified and a fix implemented. Any new scheduled or sent campaigns should process, with slight delays. We are actively replaying any campaigns that were delayed. Jan 12, 06:12 EST Investigating - Beginning around 5am US Eastern time, we began observing delays in campaign scheduling and sending. New campaigns, and scheduled RAST (calculate Recipient at Send Times) campaigns, are unable to send. However non-RAST campaigns that were scheduled prior to 5am US Eastern Time are processing as usual. We do not expect data loss. We are actively working to resolve the incident and will provide updates as soon as possible.

Dec 18, 01:36 EST Resolved - This incident has been resolved. Dec 18, 01:06 EST Monitoring - A fix has been implemented and we are monitoring the results. Dec 18, 00:12 EST Identified - The issue has been identified and a fix is being implemented. Dec 17, 23:10 EST Investigating - Starting around 9:52pm US Eastern, a database upgrade failure caused data processing delays in-app. As a result, we are experiencing delays in event processing, flows, unsubscribes, segmentation, sending for certain campaigns, and v3 APIs. No data loss is expected. We are actively working to resolve the incident and will provide updates when possible.

Dec 16, 20:49 EST Resolved - As of 8:23 PM US/Eastern on 12/16/2025, this incident has been resolved and template cloning functionality has been fully restored. Dec 16, 20:11 EST Monitoring - Beginning around 6:42 PM US/Eastern on 12/16/2025, customers may have noticed an issue with cloning templates from the Template Library. Our engineering team has identified the cause of this issue and is implementing a fix to restore functionality. We'll provide updates as soon as more information is available.

Nov 28, 17:05 EST Resolved - This incident has been resolved. Nov 28, 16:11 EST Monitoring - Access to these services (Customer Hub, Helpdesk, and Customer Agent) remains stable. We are continuing to closely monitor these systems. Nov 28, 15:46 EST Identified - Starting at 3:40pm (US Eastern), we have restored access to these services (Customer Hub, Helpdesk, and Customer Agent). We continue to closely monitor these systems. Nov 28, 15:27 EST Investigating - Starting at 3:00pm (US Eastern), Klaviyo Helpdesk, Customer Hub, and the onsite web chat functionality of Customer Agent are unavailable. Our team is investigating the issue and will update with progress as soon as possible.

Nov 18, 14:06 EST Resolved - This incident has been resolved, as of 2 pm US eastern. All affected components are operational. Nov 18, 09:34 EST Monitoring - Fixes have been implemented for some services and we are monitoring the issues. Nov 18, 08:58 EST Identified - Cloudflare declared an incident around 6:30 am US Eastern causing all onsite activities, such as unsubscribe and subscribe preference pages and onsite form submissions to error out. Forms appear, but no requests or related events or subscriptions are processing. API calls are also experiencing 403s. https://www.cloudflarestatus.com/incidents/8gmgl950y3h7 We're currently investigating mitigation steps for the affected features.

Nov 14, 17:00 EST Completed - The scheduled maintenance has been completed. Nov 14, 11:00 EST In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary. Nov 14, 09:58 EST Scheduled - Between 11:00 AM and 5:00 PM US/Eastern on Friday, November 14, 2025, Klaviyo Engineering will perform maintenance on our events infrastructure. During this maintenance window, event analytics may be delayed up to 45 minutes. No data loss will occur and no other Klaviyo functionality will be impacted.

Nov 2, 12:41 EST Resolved - The incident is now resolved. All delayed data for Facebook Integrations, which occurred between 1:00 AM and 2:00 AM, has been fully restored. Nov 2, 08:13 EST Monitoring - A fix has been identified and we are monitoring the results. Nov 2, 02:03 EST Identified - As of 1:00 AM ET (approximately one hour ago), our Facebook integration sync encountered a failure, resulting in a temporary delay in data sync. We have confirmed that no data has been lost, and the system failure is strictly impacting sync times. The root cause has been successfully identified, and our engineering team is actively working on deploying the necessary fix.

Oct 2, 13:59 EDT Resolved - This incident has been resolved. Oct 2, 13:43 EDT Monitoring - From 1:17 PM to 1:32 PM US/Eastern on 10/2/25, we experienced an issue that resulted in errors accessing the Klaviyo app, disruption in event ingestion, and issues submitting signup forms. A fix has been deployed and system performance is improving. We continue to monitor closely and appreciate your patience throughout this incident.

Sep 30, 22:31 EDT Resolved - This incident has been resolved. Sep 30, 22:16 EDT Monitoring - We are currently monitoring an issue that was impacting subscribe and unsubscribe pages for all profiles. This may have prevented profiles from opting in or out of marketing communications. We'll provide updates as soon as more information is available.

Sep 29, 09:27 EDT Resolved - This incident has been resolved. Sep 22, 15:43 EDT Monitoring - We have concluded our repairs and these campaigns should now show in the campaign list view as expected. We continue to monitor closely and appreciate your patience throughout this incident. Sep 19, 17:50 EDT Identified - We're continuing to work through repairs for this subset of campaigns. We'll provide updates as soon as more information is available. We appreciate your patience throughout this incident. Sep 19, 09:38 EDT Investigating - We are currently investigating an issue where a subset of scheduled and draft campaigns may not be appearing in the campaign list view as expected. We are actively investigating. We’ll provide updates as soon as more information is available.

Sep 19, 16:24 EDT Resolved - This incident has been resolved. Sep 19, 14:42 EDT Monitoring - Event processing has been restored to real-time. There was no data loss as a result of this incident. We’re continuing to monitor and will post another update once we have fully cleared any backlog of processing data. Sep 19, 13:07 EDT Update - A fix has been implemented and we are monitoring the results. We expect real time event processing to be fully restored within 1 hour. Sep 19, 10:38 EDT Identified - At around 7 AM Eastern time, we began experiencing delays in real-time event processing. Events may be out of date by up to 3 hours. Flows, Segments, Profiles, Reporting, as well as segment-targeted forms, may be impacted. We are actively working to restore real-time processing and will continue to provide updates here.

Sep 16, 17:21 EDT Resolved - This incident has been resolved. Sep 16, 17:17 EDT Monitoring - A fix has been deployed and system performance is improving. We continue to monitor closely and appreciate your patience throughout this incident. Sep 16, 17:05 EDT Identified - Starting 3:50pm US/Eastern on 9/16/25, we began observing delays in event-triggered flows. Users may see delays of up to 60 minutes. We're currently working on a fix. We’ll provide updates as soon as more information is available.