Klaviyo Outage History

Klaviyo is up right now

There were 2 Klaviyo outages since March 27, 2026 totaling 46m of downtime. Each is summarised below — incident details, duration, and resolution information.

Source: https://status.klaviyo.com

Minor April 26, 2026

API 503 Errors

Detected by Pingoru
Apr 26, 2026, 07:24 AM UTC
Resolved
Apr 26, 2026, 08:11 AM UTC
Duration
46m
Affected: Klaviyo API
Timeline · 3 updates
  1. identified Apr 26, 2026, 07:24 AM UTC

    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.

  2. monitoring Apr 26, 2026, 07:43 AM UTC

    We successfully implemented a fix as of 3:20 AM US/Eastern that restored all API activity. We are continuing to monitor the results.

  3. resolved Apr 26, 2026, 08:11 AM UTC

    We confirmed that all API activity has been stable since the fix was released. Any requests that returned 503 errors during the outage window will need to be retried. This incident has been resolved.

Read the full incident report →

Minor March 27, 2026

Real-time segmentation delays

Detected by Pingoru
Mar 27, 2026, 05:15 AM UTC
Resolved
Mar 27, 2026, 05:15 AM UTC
Duration
—
Timeline · 1 update
  1. monitoring Mar 27, 2026, 05:15 AM UTC

    Mar 27, 01:15 EDT Resolved - Real-time segmentation is processing in real-time, and this incident has been resolved. Mar 27, 00:46 EDT Monitoring - Starting around 8:15 PM US Eastern 26th March, we began seeing delays in real-time segment processing for a subset of customers. Segments may be out of date by up to 2.5 hours. Engineering have identified a solution and are working to implement the fix shortly. We will continue to provide updates as real-time segmentation functionality is restored.

Read the full incident report →

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