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86%of 57 verified observed days had no reported provider issue
90-Day Trend
Dashed calendar markers below identify legacy observations whose source-at-observation was not recorded.
Monthly Status Summary
Month
Issue-free days
Days Tracked
Days with issues
September 2026
86.7%
30
4
This percentage summarizes normalized provider-status observations by calendar day. It is not duration-based, component-weighted, or contractual uptime. See the methodology and limitations.
Recorded Daily Status (Last 91 Days)
Jul 22Today
Legacy observation Operational Degraded Partial Outage Major Outage Maintenance No Data
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.
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.
identified
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.
identified
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.
identified
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.
identified
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.
identified
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.
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.
investigating
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.
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.
Delays in analytics events have increased and now reach up to 1 hour and 45 minutes for all customers. Segments that rely on these events may not be up to date while our Engineering team actively processes the backlog. Campaign and flow sending, along with open and click events, remain unaffected. We are working to resolve this as quickly as possible and will share another update shortly.
identified
All customers are experiencing delays of up to an hour in analytics events, so Sent and Delivered reporting and received profile events may temporarily appear missing. Campaign and flow sending, along with open and click events, are not affected. We have identified the cause of the delays. We are working to resolve this as quickly as possible and will share another update shortly.
A fix has been deployed, and customers should now be able to log in to Klaviyo and load pages normally. If you were logged out during this incident, you may need to log in again. We continue to monitor closely and appreciate your patience throughout this incident.
identified
The issue has been identified and a fix is being implemented.
investigating
We are continuing to investigate issues preventing some customers from logging in to Klaviyo or loading pages in the app. We have not seen any impact to campaign or flow sending. We will share another update as soon as we have more information.
investigating
We are investigating reports that some customers are unable to log in to Klaviyo or are seeing pages load slowly or not at all. Our team is actively working to restore normal access. We will share another update as soon as we have more information.
Delays have now largely cleared but some customers may still see flow messages send later than expected. We continue to monitor closely and will share another update shortly.
monitoring
Flow message sending is recovering, and delays are clearing. Some customers may still see flow messages send later than expected as remaining processing catches up. We continue to monitor closely and appreciate your patience throughout this incident.
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.
investigating
We are continuing to investigate this issue.
investigating
We are investigating reports of delays affecting flow message sending. Some customers may see flow messages send later than expected. We will share another update as soon as we have more information.
Flow message sending is recovering, and delays are continuing to clear. Some customers may still see flow messages send later than expected as remaining processing catches up. We continue to monitor closely and appreciate your patience throughout this incident.
identified
We are seeing early signs of improvement and continue to work towards full recovery. Customers may still see flow messages send later than expected. We will share another update shortly.
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.
investigating
We are investigating reports of delays affecting flow message sending. Some customers may see flow messages send later than expected. We will share another update as soon as we have more information.
Event-triggered flow processing is recovering, and our systems are now working through the backlog of delayed messages. Delayed messages will continue to send automatically as the backlog clears. A fix has been deployed and system performance is improving. We continue to monitor closely and appreciate your patience throughout this incident.
identified
Our team is continuing to implement a fix to mitigate the delays affecting event-triggered flows. Delays to affected flows remain at approximately 2 hours. We are working to resolve this as quickly as possible and will share another update shortly.
identified
We have identified the cause of the delays affecting event-triggered flows. Affected flows may see delays of approximately 2 hours. Our team is now working on a fix to restore processing back to normal speed. We are working to resolve this as quickly as possible and will share another update shortly.
investigating
We are continuing to investigate the delays affecting event-triggered flows. Some customers may see these flows send with delays of approximately 90 minutes while we work to restore normal performance. We will provide another update shortly.
investigating
We are currently investigating a delay in the sending of event-triggered flows. Some customers may see these flows send later than expected. Scheduled campaigns and other areas of Klaviyo are not affected. We will share another update as soon as we have more information.
As of 9:30PM US/Eastern, flows have resumed sending as expected across all affected messaging channels. We are processing the backlog of affected flow messages. A fix has been deployed and system performance is improving.
We continue to monitor closely and appreciate your patience throughout this incident.
identified
Our Engineering team has identified the cause of this issue and is working to implement a fix to resolve the remaining impact on sending for flows affected by the time delay issue. Once the fix is rolled out, we will review and repair any impacted flows.
We are working to resolve this as quickly as possible and will share another update shortly.
investigating
At 3:25 PM US/Eastern on August 26, 2026, we began experiencing an issue where some profiles are not progressing past time delay actions in flows as expected. This is affecting flow sending across all messaging channels, including email, text messaging, push, and WhatsApp. Message sending from campaigns, and flows that do not include time delay actions are not impacted.
We are actively working on a fix. We will continue to provide updates as more information becomes available.
Legacy Incident Archive
21 archived records restored. These records predate source-at-observation attestation. They are shown as historical ServiceAlert records only and do not establish a provider-reported incident, resolution, duration, or current active state.
June 2026
Errors when attempting to select templates for campaigns
minorSource not attested
Last archived state: resolved
View archived record details
monitoring
A fix has been deployed and system performance is improving. Customers should start to be able to successfully select a template. We continue to monitor closely and appreciate your patience throughout this incident.
identified
We have identified the root cause and are working on a fix. We will share another update shortly.
investigating
Customers may be experiencing an error when selecting a template while creating or editing a campaign. Our team is actively investigating and will share another update as soon as we have more information.
Campaign sending delays
minorSource not attested
Last archived state: resolved
View archived record details
monitoring
We have deployed a fix and campaign sending is recovering. We are processing the backlog of delayed campaigns and expect to deliver them shortly. We continue to monitor closely and appreciate your patience throughout this incident.
identified
We are continuing to work through the fix for this issue. We are working to resolve this as quickly as possible and will share another update shortly.
identified
We have identified the root cause and are working on a fix. We will share another update shortly.
investigating
Some customers may be experiencing delays with campaign sending, where sends are currently stuck in processing. We are investigating the issue and will provide an update as soon as we have more information.
WhatsApp Disruption
criticalSource not attested
Last archived state: resolved
View archived record details
investigating
All WhatsApp functionality is currently unavailable for customers due to an upstream provider outage (including sending, integration setup and template editing). The Engineering team is actively investigating and will share more information as soon as it becomes available.
Shopify API Outage
majorSource not attested
Last archived state: resolved
View archived record details
monitoring
We're seeing further recovery for Shopify integrations, and Shopify data syncing is returning to normal. Automated retry processes are working through the backlog of affected requests. No action is required for customers with existing integrations. Customers who saw errors while setting up a new Shopify integration can retry that setup. We continue to monitor closely and appreciate your patience throughout this incident.
identified
The issue has been identified and we are seeing early signs of recovery. We are continuing to monitor the situation closely and will share another update shortly.
investigating
Klaviyo is aware of an issue affecting the Shopify integration.
Some customers attempting to set up a new Shopify integration, or performing actions that depend on the Shopify API, may be encountering errors.
Customers with existing integrations may experience delays in Shopify data syncing. The issue is caused by a partial outage affecting an upstream service, and our team is actively monitoring the situation while automated retry processes work to recover affected requests.
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May 2026
SMS Event Processing Delays
minorSource not attested
Last archived state: resolved
View archived record details
identified
We have identified the cause of the issue and SMS event processing is recovering. Delays in processing SMS events are currently around 3 hours and continue to decrease. SMS campaign sending continues to be unaffected and recipients are continuing to receive messages at the expected send times. Customers may continue to see downstream delay in SMS event-triggered flow sending, real-time segments built on SMS event data, and reporting until processing has fully caught up. Customers may also enc...
investigating
SMS event processing is delayed by approximately 2–3 hours. SMS sending is not impacted and recipients are receiving messages at the expected send times. This is impacting when SMS-related events appear in customer accounts, which may cause a delay in SMS event-triggered flows, real-time segments built on SMS event data, and reporting. Our team is actively investigating and we'll provide updates as soon as more information is available.
Page loading errors
minorSource not attested
Last archived state: resolved
View archived record details
monitoring
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.
identified
We have identified the cause of the intermittent errors and slow page loads some customers are experiencing in the Klaviyo app. Some customers may also be experiencing delays of up to 20 minutes for email and SMS sends, as well as delays in flows that send push notifications. Our engineering team is deploying a fix.
investigating
Customers may be experiencing intermittent errors and slow page loads in the Klaviyo app. Our engineering team is actively investigating. We'll provide updates as soon as more information is available.
Campaign and flow page loading errors
minorSource not attested
Last archived state: resolved
View archived record details
monitoring
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.
identified
Sending, scheduling, and other core functions are operating normally. Analytics for campaigns and flows are currently delayed by approximately 2 hours. These issues are tied to instability with an upstream infrastructure provider (AWS) and we are continuing to work through them. We'll provide updates as soon as we have more to share.
identified
System performance is improving, and users can now access campaigns pages to complete scheduling. We determined these errors resulted from a combination of instability with an upstream infrastructure provider (AWS) and a significant increase in retry traffic. We continue to monitor closely and appreciate your patience throughout this incident.
identified
We have identified the root cause of the errors and our engineering team is actively working toward a resolution. We'll provide updates as soon as more information is available.
investigating
We are currently investigating reports of errors loading campaign and flow pages within Klaviyo. Campaign and flow sending is not impacted. Our engineering team is actively working to identify and resolve the issue. We'll provide updates as soon as more information is available.
Processing delays
minorSource not attested
Last archived state: resolved
View archived record details
monitoring
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.
identified
Segmentation has been restored to realtime processing. Our engineering team continues to restore the remaining affected analytics. We will continue to provide updates as real-time analytics functionality resumes.
identified
A subset of customers are currently experiencing segmentation processing delays of approximately 1.5 hours and may find that analytics data is not fully up to date. Access to reporting pages has been restored and our engineering team is actively working to bring segmentation and analytics back to real time. We'll provide updates as soon as more information is available.
identified
Our engineering team continues to investigate areas affected by an upstream service provider. Customers may experience processing delays for segmentation and analytics, and loading issues with reporting pages.
For campaigns, sends may not reach the most up-to-date audience due to segmentation delays. Segment-triggered flows may also fail to trigger correctly as profiles may not be added to or removed from segments as expected. We'll provide updates as soon as more information is available.
investigating
We are currently investigating an issue affecting analytics and reporting, flows, campaigns, and segmentation. This issue appears to be related to a disruption with an upstream service provider. Customers may experience errors or be unable to load flows and campaigns pages, see delays in real-time segmentation updates, and find analytics data temporarily unavailable.
Our team is actively working to resolve this. We'll provide updates as soon as more information is available.
Klaviyo Service Disruption
criticalSource not attested
Last archived state: resolved
View archived record details
monitoring
Klaviyo services remain restored and operating as expected. Most recovery and repair work is now complete. Remaining work is focused on restoring webhook connections for a subset of WooCommerce and Eventbrite integrations and a subset of campaign analytics repairs, neither of which is affecting customer use of the platform. Our team is continuing to monitor closely.
monitoring
Klaviyo services remain restored and operating as expected. Final background recovery and repair work is ongoing, but is not affecting customer use of the platform. Our team is continuing to monitor closely.
monitoring
Klaviyo services have been restored. Some background data reconciliation and recovery work is still in progress. This is not affecting overall system availability or customer use of the platform. Our team is continuing to monitor closely as we complete final repair efforts.
monitoring
Access to klaviyo.com and core platform services has been restored. The majority of platform areas have returned to normal operation, with many affected services recovering automatically as infrastructure came back online. Our team is continuing to monitor platform stability and is actively working through remaining data repairs, including unsubscribe processing and analytics recovery. We will share further updates as this work progresses.
monitoring
Our engineering team has restored the impacted services and confirmed that systems have resumed functioning as intended. All Campaign/Flow messages impacted which are able to be replayed are currently sending. We're currently monitoring performance and will continue to update as incident is resolved.
identified
We are seeing recovery across APIs, event ingestion, and subscriptions. Our team continues to work toward restoring full functionality.
identified
Recovery is continuing to progress, and additional services are coming back online. Our team remains actively engaged, and we'll provide another update shortly.
identified
Access to klaviyo.com has been restored, and dependent services are progressively coming back online. Our team continues to work toward full recovery, which we expect within the next hour. We'll provide another update in 30 minutes.
investigating
We are continuing to investigate the issue affecting access to klaviyo.com and all associated services. Our engineering team is actively working to restore affected services. We will provide updates as soon as more information is available.
investigating
Our engineering team is continuing to investigate the disruption affecting klaviyo.com, our APIs, and message sending. We will provide updates as more information is available.
investigating
Klaviyo is currently experiencing a service disruption affecting access to klaviyo.com, our APIs, and message sending. Customers may be unable to log in, send campaigns or flows, or have their events processed during this time. Our engineering team is actively investigating the root cause. We'll provide updates as soon as more information is available.
April 2026
API 503 Errors
minorSource not attested
Last archived state: resolved
View archived record details
monitoring
We successfully implemented a fix as of 3:20 AM US/Eastern that restored all API activity. We are continuing to monitor the results.
identified
Starting at approximately 2:27 AM US/Eastern on 04/25/2026, we began experiencing intermittent elevated errors across our APIs. Some customers may experience 503 errors when trying to log into Klaviyo, load certain pages or make API requests. Our Engineering Team has identified the root cause and has implemented mitigations. We'll provide updates as soon as more information is available.
