Major incident

Klaviyo: Klaviyo app slowness

Affected: Klaviyo App, Analytics

Current status of Klaviyo: Operational — live Klaviyo status

Timeline

1. Nov 4, 2026, 16:17 UTC
   investigating
   Some customers may be experiencing slow load times across the Klaviyo app. Our team is actively looking into the cause. We will share another update as soon as we have more information.
2. Nov 4, 2026, 16:53 UTC
   investigating
   We are seeing early signs of improvement in load times across the Klaviyo app. Some pages, including reporting and metrics, may still be slow or show errors. Our team is continuing to investigate. We will share another update as soon as we have more information.
3. Nov 4, 2026, 17:35 UTC
   investigating
   Load times across the Klaviyo app continue to improve. Some reporting and metrics pages may show errors, appear blank, or display out-of-date data. Campaign and flow sending are not affected. We will share another update as soon as we have more information.
4. Nov 4, 2026, 18:26 UTC
   identified
   Page load times across the Klaviyo app have improved significantly, though some pages may still load slowly. To support this recovery, we temporarily paused some background processing, so reporting and metrics may show out-of-date data or errors. Campaign and flow sending are not affected. We will share another update as soon as we have more information.
5. Nov 4, 2026, 19:31 UTC
   identified
   Page load times remain improved. Some reporting and metrics may still show out-of-date data, and a subset of requests to our metrics and reporting APIs may return errors. Campaign and flow sending are not affected. We will share another update as soon as we have more information.
6. Nov 4, 2026, 20:45 UTC
   identified
   Page load times across the Klaviyo app have returned to normal, and we have restarted the background processing behind reporting and metrics. Some of this data may continue to appear out of date while it catches up. Campaign and flow sending are not affected. We will share another update as soon as we have more information.
7. Nov 4, 2026, 22:02 UTC
   identified
   Reporting and metrics continue to catch up, so some data may still appear out of date. Page load times remain normal. Some requests to our metrics and reporting APIs may also continue to return errors. We will share another update as soon as we have more information.
8. Nov 4, 2026, 23:12 UTC
   monitoring
   Reporting and metrics have caught up and are now up to date, and requests to our metrics and reporting APIs are returning normally. If you recently changed your attribution settings, updated revenue attribution for past messages may take longer than usual to appear. We continue to monitor closely and appreciate your patience throughout this incident.
9. Nov 5, 2026, 17:31 UTC
   resolved
   Reporting, metrics, and page load times remain stable, and attribution settings changes are processing normally again. We apologize for the disruption this caused. This incident has been resolved.

Updates as published by Klaviyo (original).