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Klaviyo Outage History

Daily provider-status observations and published incident history for Klaviyo.

Operational

Klaviyo is operational. Verified . Official provider source.

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86% of 57 verified observed days had no reported provider issue

90-Day Trend

Jul 23Oct 20

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 22 Today
Legacy observation Operational Degraded Partial Outage Major Outage Maintenance No Data

Incident History

October 2026
Flow Sending Delays
major Observed active window 4h 53m

View incident details and source

Started:

Email Sending Text Message Sending WhatsApp Sending Mobile Push Sending Flow Editor Processing
monitoring
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.
Analytics Events Processing Delays
minor Observed active window 2h 9m

View incident details and source

Started:

Segments Profiles Analytics
identified
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.
Login and page loading issues
critical Observed active window 1h 14m

View incident details and source

Started:

Klaviyo App
monitoring
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.
September 2026
Flow sending delays
minor Observed active window 2h 3m

View incident details and source

Started:

Email Sending Text Message Sending WhatsApp Sending Mobile Push Sending Processing
monitoring
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 sending delays
minor Observed active window 2h 39m

View incident details and source

Started:

Email Sending Text Message Sending WhatsApp Sending Mobile Push Sending Processing
monitoring
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.
Sending delays for event-triggered flows
minor Observed active window 4h 24m

View incident details and source

Started:

Email Sending Text Message Sending WhatsApp Sending Mobile Push Sending Processing
monitoring
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.
August 2026
Issue with Time Delays in Flows
major Observed active window 3h 35m

View incident details and source

Started:

Email Sending Text Message Sending WhatsApp Sending Mobile Push Sending Processing
monitoring
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.

August 2026
Delays in real-time segmentation
minor Source not attested
Last archived state: resolved
View archived record details
Segments Profiles
monitoring
A fix has been deployed and system performance is improving. Recent profile property updates are now being reflected in real-time segments more quickly, and the delay has improved to approximately 2.5 hours. Changes to profiles may still take slightly longer than usual to update segment membership as the system continues to catch up. Email and SMS sending and other core functions remain unaffected. We continue to monitor closely and appreciate your patience throughout this incident.
identified
We are currently experiencing delays of up to approximately 3 hours in how quickly recent profile property updates are reflected in real-time segments. This means changes to profiles may take longer than usual to update segment membership, which can affect segment-based targeting. Email and SMS sending and other core functions are operating normally. We are actively working to resolve this and will share another update as soon as we have more information.
Campaign scheduling errors
Source not attested
Last archived state: resolved
View archived record details
monitoring
Between 1:15 PM and 2:00 PM US/Eastern on August 12, 2026, some customers experienced errors when scheduling campaigns, and some scheduled campaigns were canceled. If you scheduled a campaign during this window, we recommend checking its status in your account. A fix has been deployed and system performance is improving. We continue to monitor closely and will confirm once fully resolved.
Delays affecting campaign scheduling, preview emails, and double opt-in confirmations
minor Source not attested
Last archived state: resolved
View archived record details
monitoring
A fix has been deployed and the affected email subscription and campaign features have recovered. Double opt-in confirmation emails are sending again, and preview emails and estimated recipient counts are working as expected. We continue to monitor closely and appreciate your patience throughout this incident.
identified
We have identified the source of the issue affecting some email subscription and campaign features. Customers may continue to see errors when sending preview emails and customers using double opt-in may find that new subscribers are not receiving confirmation emails. Campaign scheduling has recovered and is working as expected. We are working to resolve this as quickly as possible and will share another update shortly.
investigating
Beginning around 12:00 PM US/Eastern on August 5, 2026, we began investigating an issue affecting some email subscription and campaign features. Customers using double opt-in may find that new subscribers are not receiving confirmation emails as expected. Some users may encounter errors when sending preview emails, scheduling campaigns, or checking estimated recipient counts. Our team is working to resolve this. We will share another update as soon as we have more information.
July 2026
Sync Tasks Failing
minor Source not attested
Last archived state: resolved
View archived record details
monitoring
Profile imports have recovered, and imports through the API, CSV upload, or SFTP are processing normally again. Integrations connected during the impact window are also resuming their initial syncs. Our team is working to reprocess API imports that failed during the incident. We continue to monitor closely and appreciate your patience throughout this incident.
identified
Beginning around 8:09 AM US/Eastern on July 23, 2026, profile imports started through the API, CSV upload, or SFTP may fail to complete, and the imported profiles may not be created. New integrations connected during this period may also be delayed in starting their initial sync. We have identified the cause and are deploying a fix. We are working to resolve this as quickly as possible and will share another update shortly.
Elevated errors for SMS opt-ins, scheduling, and sending
major Source not attested
Last archived state: resolved
View archived record details
monitoring
System performance for SMS opt-in forms, sending, and campaign creation and scheduling remains stable. We continue to monitor closely and appreciate your patience throughout this incident.
identified
We have identified the cause of the issue and a fix has been implemented. We are starting to see improvements in system performance.
investigating
We are currently investigating an issue impacting SMS subscriptions, delays in SMS sending, and errors when creating or scheduling SMS and WhatsApp campaigns. We are working to restore normal service as quickly as possible. We will share another update as soon as we have more information.
Catalog Webhook Processing Delays
minor Source not attested
Last archived state: resolved
View archived record details
monitoring
Product updates from ecommerce integrations are continuing to sync normally in real time. A background repair to fully update records from the earlier impact window (9:45 PM to 11:13 PM US/Eastern on July 8, 2026) is still in progress. We will confirm once this repair is complete.
monitoring
As of 11:13 PM US/Eastern on July 8, 2026, we have resumed processing webhooks. This means all new webhooks from integrations which use webhooks to update products are now syncing in real time. Our Engineering Team is working implement a repair to catch up on any product update webhooks from during window of impact (9:45 PM and 11:13 PM US/Eastern July 8, 2026). We will confirm once the repair has been complete and the incident has been fully resolved.
identified
As of 9:45 PM US/Eastern on July 8, 2026, we paused processing new webhooks for product catalogs while we continue working on a fix. Catalog data, including in Templates and Customer Hub, will remain out of date until syncing resumes. Our engineering team is actively working to restore realtime catalog updates. We'll provide updates as soon as more information is available.
investigating
At 4:00 PM US/Eastern on July 8, 2026, we identified delays syncing product updates from integrations using webhooks. This is causing catalog data, including in Templates and the Customer Hub, to not update in real time. Customer may see product data being out of date by up to 4 hours. Sending is not impacted but the product data in templates may not reflect real-time information. We are working to resolve this as quickly as possible and will share another update shortly.
Klaviyo Loading Errors and Sending Delays
minor Source not attested
Last archived state: resolved
View archived record details
monitoring
Sending delays have recovered, and login and navigation are operating normally. We continue to monitor closely and appreciate your patience throughout this incident.
identified
Campaign and flow sends are now delayed by less than 30 minutes and are continuing to recover. Login and navigation are operating normally. We will share another update shortly.
identified
Performance issues affecting login and general navigation in Klaviyo have recovered, and those areas are now operating normally. Some customers may still be experiencing delays with sends while we work to fully restore normal processing. We have identified the cause and are working to resolve the remaining impact as quickly as possible. We will share another update shortly.
investigating
Customers may be experiencing slower than usual performance when loading or navigating Klaviyo, and some sends may be delayed. We are actively investigating. We will share another update as soon as we have more information.
Infrastructure for consent.
Source not attested
Last archived state: resolved
View archived record details
investigating
Beginning at 6:00 PM (US Eastern Time) on Monday, July 6th, 2026, Klaviyo's Engineering team will perform maintenance on our infrastructure for consent. We expect the maintenance period to last approximately 1 hour. During this time, in-app and API operations related to SMS and Whatsapp Consent may be temporarily unavailable. This includes subscribes and unsubscribes. Please note that no data will be lost during this maintenance and these features should run as expected once maintenance has ...
Yahoo PH01 Block — Email Bounces to Yahoo/AOL Recipients
minor Source not attested
Last archived state: resolved
View archived record details
investigating
Starting at 02:30AM US/Eastern on 07/02/2026, a subset of customers are currently experiencing an increase in bounced emails to Yahoo and AOL recipients with the reason of "554 Message not allowed - [PH01] Email not accepted for policy reasons.". Our Engineering and Deliverability teams are actively investigating and working with Yahoo to resolve the issue. We do not recommend resending to those bounced recipients at this moment in time.
June 2026
Meta Services Disruption
major Source not attested
Last archived state: resolved
View archived record details
monitoring
We are seeing further recovery with WhatsApp messaging, Meta integrations, and Instagram connectivity. WhatsApp messaging should no longer encounter failures. We've replayed all failed messages during this time period. We continue to monitor and will confirm once recovery has completed.
identified
Customers may continue to experience issues with Meta-connected features in Klaviyo, including WhatsApp messaging, Meta integrations, and Instagram connectivity. This is caused by a disruption at an upstream provider that affects connections to these features. We have begun to see partial recovery, and some messages are now sending successfully. We are working to resolve this quickly and will share another update as soon as more information is available.
investigating
Customers are currently experiencing issues with Meta-connected features in Klaviyo, including WhatsApp messaging, Meta integrations, and Instagram connectivity. We are investigating a disruption with an upstream provider and will share another update as soon as we have more information.
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