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Outage in Klaviyo

Delays in real-time segmentation

Resolved Minor
August 19, 2026 - Started about 5 hours ago - Lasted about 1 hour
Official incident page

Incident Report

Summary AI Generated

Klaviyo experienced a 1.5-hour incident where profile property updates were delayed by up to 3 hours in reflecting within real-time segments, impacting segment membership and targeting accuracy. Email and SMS sending remained unaffected throughout. A fix was deployed, and all profile changes made during the incident window were successfully backfilled with no action required from users.

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.

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Latest Updates ( sorted recent to last )
RESOLVED about 3 hours ago - at 08/19/2026 06:38PM

Profile property updates are now being reflected in real-time segments at normal speed. Any profile property changes made during the incident window have been reflected in segment membership as expected, and no action is required on your part. This incident has been resolved.

MONITORING about 4 hours ago - at 08/19/2026 06:13PM

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 about 5 hours ago - at 08/19/2026 05:15PM

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.

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