Outage in Substack

Substack experiencing increased latency

Resolved Minor
September 15, 2025 - Started about 2 months ago - Lasted about 4 hours
Official incident page

Incident Report

We are currently investigating reports of increased latency and slow response times across Substack.

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Latest Updates ( sorted recent to last )
RESOLVED about 2 months ago - at 09/15/2025 07:12PM

This incident has been resolved.

MONITORING about 2 months ago - at 09/15/2025 06:39PM

Substack is operating normally and our team is monitoring.

IDENTIFIED about 2 months ago - at 09/15/2025 05:43PM

We are seeing recurrence of increased error rates and degraded performance across Substack.

MONITORING about 2 months ago - at 09/15/2025 04:53PM

As part of the earlier incident, we are noting delays in analytics updating and post email delivery. We are working to resolve the issue.

MONITORING about 2 months ago - at 09/15/2025 04:46PM

We are seeing recovery of performance across Substack and are monitoring the issue.

IDENTIFIED about 2 months ago - at 09/15/2025 04:38PM

We are working to resolve the remaining performance issues across Substack and expect to see recovery shortly.

IDENTIFIED about 2 months ago - at 09/15/2025 03:50PM

We are continuing to investigate increased latency and error rates across Substack.

IDENTIFIED about 2 months ago - at 09/15/2025 03:42PM

We have identified an issue and are seeing normal performance across all systems.

INVESTIGATING about 2 months ago - at 09/15/2025 03:34PM

We are continuing to investigate increased latency and error rates across Substack.

INVESTIGATING about 2 months ago - at 09/15/2025 03:24PM

We are currently investigating reports of increased latency and slow response times across Substack.

Latest Substack outages

Post emails delayed - 20 days ago
Post notifications are delayed - about 1 month ago
Post email delivery is delayed - about 2 months ago

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