Slack outage history and postmortems
Apps and SaaS · 7 incidents in 90 days · 99.51% implied uptime · last 12d ago
Incidents
38 on fileAbout Slack
The last year, day by day
Downtime, added up
Slack: 10h 39m weighted downtime in range, category median 29m.
7 incidents, 0 major or critical, 7d 19h of incident time (0m major or critical, 7d 19h partial), longest 7d, implied uptime 99.51%, between Jun 28, 2026 and Sep 25, 2026.
Postmortems
| Started | Incident | Impact | Root cause | Duration |
|---|---|---|---|---|
| Jan 414:57 UTC | Overloaded AWS Transit Gateway takes Slack down on the first workday of 2021 | critical | Capacity | 2h 18m |
Across fru.dev:Company profileCompliancePaydaysUptime
Questions
Is Slack down right now?
Check Slack's own status page at https://slack-status.com for the live state. This page shows Slack's incident history from that page; the most recent incident started 2026-09-12: "Some customers experiencing blurry image previews and download issues".
How often does Slack have outages?
Slack posted 7 incidents in the last 90 days and 37 in the last year, 0 of them major or critical in the last 90 days. The median incident lasted 2h 40m.
When was Slack's last major outage?
2021-01-04: "Overloaded AWS Transit Gateway takes Slack down on the first workday of 2021", lasting 2h 18m.
What usually causes Slack incidents?
Where Slack explained the cause, the most common was deployment or rollout (3 incidents). Most status updates do not name a cause.
Sources: vendors' own status pages, published postmortems and SEC 8-K Item 1.05 filings, read daily. Times as reported. Logos via logo.dev; trademarks belong to their owners.