Outbound Webhook Delays
Monitoring - New event webhooks are being delivered again after processing resumed at 11:28 PM US/Eastern on October 22, 2026. Some customers and third-party apps connected to Klaviyo accounts may continue to see delays while the backlog is processed, and we expect these delays to decrease over time. Webhook data has been retained, and webhook actions in flows are not affected at this time. We continue to monitor closely and appreciate your patience throughout this incident.
Oct 23, 2026 - 00:07 EDT
Identified - Some customers and third-party apps connected to Klaviyo accounts are experiencing delays receiving event webhooks. Webhook actions in flows are not affected at this time. To support recovery, we temporarily paused processing of new webhooks at 5:11 PM US/Eastern on October 22, 2026, and earlier webhooks are still being delivered with delays. Webhook data is being retained, and we expect delayed and paused webhooks to be delivered once processing resumes. We are working to resolve this as quickly as possible and will share another update shortly.
Oct 22, 2026 - 18:20 EDT
Uptime over the past 90 days. View historical uptime.
Platform Operational
Klaviyo App Operational
Klaviyo Support Operational
Klaviyo Help Center Operational
Klaviyo Developers Operational
Klaviyo Marketing Operational
API Operational
Server-side Operational
Client-side Operational
Composer Operational
Campaigns Operational
Email Sending Operational
Text Message Sending Operational
WhatsApp Sending Operational
Mobile Push Sending Operational
Campaign Editor Operational
Flows Operational
Email Sending Operational
Text Message Sending Operational
WhatsApp Sending Operational
Mobile Push Sending Operational
Flow Editor Operational
Processing Operational
Website Operational
Sign-up Forms Operational
Landing Pages Operational
Consent Pages Operational
Customer Hub Operational
Reviews Operational
Social Operational
Auto-replies Operational
Content Operational
Service Operational
Customer Agent Operational
Helpdesk Operational
Audience Operational
Lists Operational
Segments Operational
Profiles Operational
Analytics Degraded Performance
Integrations Operational
Shopify Operational
Meta Operational
WooCommerce Operational
BigCommerce Operational
Magento Operational
Other Operational
Deliverability Operational
Email Deliverability Operational
Text Message Deliverability Operational
Operational
Degraded Performance
Partial Outage
Major Outage
Maintenance
Major outage
Partial outage
No downtime recorded on this day.
No data exists for this day.
had a major outage.
had a partial outage.

No incidents or maintenance related to this downtime.

Oct 23, 2026

Unresolved incident: Outbound Webhook Delays.

Oct 22, 2026

Oct 21, 2026

No incidents reported.

Oct 20, 2026

No incidents reported.

Oct 19, 2026

No incidents reported.

Oct 18, 2026

No incidents reported.

Oct 17, 2026

Flow Sending Delays
Resolved - Flow processing has returned to normal, and delayed flow actions - including email, SMS, and push messages, as well as profile and list updates - have fully caught up. Immediate sends were not affected. We apologize for the disruption this caused. This incident has been resolved.
Oct 17, 17:51 EDT
Update - Delays have now largely cleared, though some customers may still see flow messages send later than expected. We continue to monitor closely and appreciate your patience throughout this incident.
Oct 17, 17:34 EDT
Monitoring - Flow processing has resumed and the delayed backlog is actively clearing. This incident affected all flow processing - including flow-triggered email, SMS, WhatsApp and push messages, as well as flow updates to profiles and lists. Some customers may continue to see delays until the backlog fully catches up. Immediate sends were not affected. We continue to monitor closely and appreciate your patience throughout this incident.
Oct 17, 16:59 EDT
Update - We are continuing to work on resolving the delays affecting flow processing. Some customers may continue to experience delays in their flows while we work through this. Immediate sends remain unaffected, and delayed messages remain queued while we work to process them. We will share another update shortly.
Oct 17, 16:22 EDT
Update - We are continuing to work on the fix for this issue. Some customers may continue to experience delays in flow processing while we resolve this. Immediate sends remain unaffected. We will share another update shortly.
Oct 17, 15:42 EDT
Update - We are still working to clear the delayed flow execution, and flow sending has not yet returned to normal. Some customers may continue to see messages send later than expected while we complete this work. Immediate sends remain unaffected. We will share another update shortly.
Oct 17, 15:04 EDT
Update - We are actively working to clear the delayed flow emails and restore normal flow email sending. Some customers may still see flow emails send later than expected while this work completes. Immediate sends remain unaffected. We will share another update shortly.
Oct 17, 14:31 EDT
Update - We are continuing to work on the fix for this issue. Some customers may continue to see flow emails send later than expected while we resolve this. Immediate sends remain unaffected. We will share another update shortly.
Oct 17, 14:06 EDT
Identified - We have identified the cause of the delays affecting flow message sending and are working on a fix. Some customers may continue to see flow messages send later than expected while we resolve this. We will share another update shortly.
Oct 17, 13:35 EDT
Update - We are continuing to investigate delays affecting some flow email sending. Immediate sends remain unaffected. We will share another update as soon as we have more information.
Oct 17, 13:31 EDT
Investigating - We are investigating reports of delays affecting flow message sending. Some customers may see flow messages send later than expected. Immediate sends are not affected and are going out as expected. We will share another update as soon as we have more information.
Oct 17, 13:01 EDT

Oct 16, 2026

No incidents reported.

Oct 15, 2026

No incidents reported.

Oct 14, 2026

No incidents reported.

Oct 13, 2026

No incidents reported.

Oct 12, 2026

No incidents reported.

Oct 11, 2026

No incidents reported.

Oct 10, 2026

No incidents reported.

Oct 9, 2026

No incidents reported.

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