Zulip Outage History

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Zulip had 10 outages in the last 2 years totaling 26h 4m of downtime, averaging 0.4 incidents per month.

There were 10 Zulip outages since January 23, 2025 totaling 26h 4m of downtime. Each is summarised below. Incident details, duration, and resolution information.

Source: status.zulip.com

Minor May 21, 2026

External images preview outage

Detected by Pingoru
May 21, 2026, 06:43 PM UTC
Resolved
May 21, 2026, 07:19 PM UTC
Duration
36m
Affected: Zulip Cloud
Timeline · 2 updates
  1. identified May 21, 2026, 06:43 PM UTC

    We have identified that we are failing to serve previews of external images linked from Zulip messages.

  2. resolved May 21, 2026, 07:19 PM UTC

    This incident has been resolved.

Read the full incident report →

Critical April 22, 2026

Outage

Detected by Pingoru
Apr 22, 2026, 05:32 PM UTC
Resolved
Apr 22, 2026, 09:25 PM UTC
Duration
3h 52m
Affected: Zulip CloudMobile Push Notification ServiceEmail notifications
Timeline · 4 updates
  1. investigating Apr 22, 2026, 05:32 PM UTC

    We are currently investigating this issue.

  2. identified Apr 22, 2026, 05:47 PM UTC

    The issue has been identified and a fix is being implemented.

  3. monitoring Apr 22, 2026, 06:00 PM UTC

    A fix has been implemented and we are monitoring the results.

  4. resolved Apr 22, 2026, 09:25 PM UTC

    This incident has been resolved.

Read the full incident report →

Major April 1, 2026

Partial outage

Detected by Pingoru
Apr 01, 2026, 12:26 AM UTC
Resolved
Apr 01, 2026, 01:20 AM UTC
Duration
53m
Affected: Zulip CloudMobile Push Notification Service
Timeline · 3 updates
  1. investigating Apr 01, 2026, 12:26 AM UTC

    We are currently investigating this issue.

  2. monitoring Apr 01, 2026, 12:49 AM UTC

    A fix has been implemented and we are monitoring the results.

  3. resolved Apr 01, 2026, 01:20 AM UTC

    This incident has been resolved.

Read the full incident report →

Critical March 26, 2026

zulip.com outage

Detected by Pingoru
Mar 26, 2026, 02:04 PM UTC
Resolved
Mar 26, 2026, 05:59 PM UTC
Duration
3h 55m
Affected: Zulip CloudMobile Push Notification Service
Timeline · 4 updates
  1. investigating Mar 26, 2026, 02:04 PM UTC

    We are currently investigating this issue.

  2. monitoring Mar 26, 2026, 02:11 PM UTC

    A fix has been implemented and we are monitoring the results.

  3. monitoring Mar 26, 2026, 02:11 PM UTC

    We are continuing to monitor for any further issues.

  4. resolved Mar 26, 2026, 05:59 PM UTC

    This incident has been resolved.

Read the full incident report →

Critical January 14, 2026

Service outage

Detected by Pingoru
Jan 14, 2026, 06:56 AM UTC
Resolved
Jan 14, 2026, 07:19 AM UTC
Duration
23m
Affected: Zulip CloudMobile Push Notification ServiceEmail notifications
Timeline · 3 updates
  1. investigating Jan 14, 2026, 06:56 AM UTC

    We've experienced a service outage, and we're investigating.

  2. monitoring Jan 14, 2026, 06:57 AM UTC

    A fix has been implemented and we are monitoring the results.

  3. resolved Jan 14, 2026, 07:19 AM UTC

    This incident has been resolved.

Read the full incident report →

Minor December 19, 2025

Image thumbnailing delays

Detected by Pingoru
Dec 19, 2025, 02:01 PM UTC
Resolved
Dec 19, 2025, 03:13 PM UTC
Duration
1h 12m
Affected: Zulip Cloud
Timeline · 3 updates
  1. investigating Dec 19, 2025, 02:01 PM UTC

    We're investigating delays generating image thumbnails.

  2. monitoring Dec 19, 2025, 02:05 PM UTC

    We've cleared the image thumbnailing backlog, and are monitoring the fix.

  3. resolved Dec 19, 2025, 03:13 PM UTC

    This incident has been resolved.

Read the full incident report →

Minor October 20, 2025

Outgoing email outage

Detected by Pingoru
Oct 20, 2025, 04:45 PM UTC
Resolved
Oct 20, 2025, 06:28 PM UTC
Duration
1h 42m
Affected: Email notifications
Timeline · 3 updates
  1. investigating Oct 20, 2025, 04:45 PM UTC

    We believe this issue to be related to AWS' ongoing global outage.

  2. monitoring Oct 20, 2025, 05:08 PM UTC

    We have failed over our outgoing email service, and backlogged messages have completed being sent.

  3. resolved Oct 20, 2025, 06:28 PM UTC

    This incident has been resolved.

Read the full incident report →

Minor August 14, 2025

Some Apple push notifications were not sent

Detected by Pingoru
Aug 14, 2025, 02:16 PM UTC
Resolved
Aug 14, 2025, 03:54 PM UTC
Duration
1h 37m
Affected: Mobile Push Notification Service
Timeline · 3 updates
  1. identified Aug 14, 2025, 02:16 PM UTC

    A very small minority of Apple push notifications failed to be delivered since Aug 13 at 03:04 UTC; overall, this was 0.04% of notifications which were affected.

  2. monitoring Aug 14, 2025, 03:20 PM UTC

    A fix has been implemented and we are monitoring the results.

  3. resolved Aug 14, 2025, 03:54 PM UTC

    This incident has been resolved.

Read the full incident report →

Notice June 11, 2025

Incoming email outage

Detected by Pingoru
Jun 11, 2025, 05:22 AM UTC
Resolved
Jun 11, 2025, 01:42 PM UTC
Duration
8h 20m
Timeline · 1 update
  1. resolved Jun 11, 2025, 02:30 PM UTC

    From 05:22 to 13:42 UTC, incoming email integrations (to email addresses @streams.zulipchat.com) were dropped, due to an improper configuration change during a deploy. Unfortunately, we do not have access to the bounced messages, so any incoming emails in this time frame have been lost.

Read the full incident report →