The intermittent errors, slow page loads, and delays for email and SMS sends have been resolved. A small number of push notifications from impacted flows are being replayed and will deliver shortly. This incident has been resolved.
Posted May 19, 2026 - 13:38 EDT
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.
Posted May 19, 2026 - 13:17 EDT
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.
Posted May 19, 2026 - 12:46 EDT
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.
Posted May 19, 2026 - 12:11 EDT
This incident affected: Klaviyo App (Klaviyo App), Email Sending (Campaign Email Sending, Flow Email Sending), SMS Sending (SMS Sending - Toll Free Number SMS, SMS Sending - Toll Free Number MMS, SMS Sending - Short Code SMS, SMS Sending - Short Code MMS, SMS Sending - Other), and Mobile Push Sending.