# Substack in October 2021: incidents, uptime and changes

> Substack in October 2021: 5 incidents on its status page (4 major or critical), 99.75% free of major or critical incidents (vendor-reported). From Rewindex’s archive of Substack’s status, pricing and policy pages.

Canonical: https://rewindex.com/company/substack/2021/10
Last updated: 2021-11-01T00:00:00Z

- Incidents posted: 5 (major/critical: 4) · Maintenance: 1
- By vendor impact label: critical 1, major 3, minor 1
- Uptime (vendor-reported): 99.75% free of major/critical incidents, 99.31% free of any incident; outage time 1 h 51 min, incident time 5 h 5 min
- Price changes: 0 · Pricing/legal/trust page changes: 0 · Deprecations: 0 · CVEs: 0
- Previous month: [September 2021](https://rewindex.com/company/substack/2021/09.md) · Next: [November 2021](https://rewindex.com/company/substack/2021/11.md) · [All months](https://rewindex.com/company/substack/reports.md) · [Substack](https://rewindex.com/company/substack.md)

_Uptime: Derived from the incidents the vendor posted on its own status page, not measured by us. A minute counts as an outage minute when a major or critical incident (as the vendor labelled it) was open; incident minutes include minor ones too. Maintenance and incidents marked "no impact" are left out, overlapping incidents are merged, a resolved incident counts for at most 7 days, and one still open with no resolution counts for at most 24 hours._

## Major and critical incidents

| Incident | Impact (vendor label) | Started (UTC) | Resolved (UTC) | Duration | Status |
| --- | --- | --- | --- | --- | --- |
| [Substack is down](https://rewindex.com/company/substack/incidents/hjksb3ftp8sz.md) | critical | 2021-10-06 20:45 UTC | 2021-10-06 21:02 UTC | 17 min | resolved |
| [Substack is intermittently unavailable](https://rewindex.com/company/substack/incidents/1rltvvn8hfmt.md) | major | 2021-10-06 21:14 UTC | 2021-10-06 21:51 UTC | 37 min | resolved |
| [Substack](https://rewindex.com/company/substack/incidents/nhk7ks5bp8w3.md) | major | 2021-10-14 16:30 UTC | 2021-10-14 16:30 UTC | 0 min | resolved |
| [Partial site outage](https://rewindex.com/company/substack/incidents/6q6mcsv3b5wh.md) | major | 2021-10-28 17:35 UTC | 2021-10-28 18:32 UTC | 57 min | resolved |

## All incidents

| Incident | Impact (vendor label) | Started (UTC) | Resolved (UTC) | Duration | Status |
| --- | --- | --- | --- | --- | --- |
| [Substack is down](https://rewindex.com/company/substack/incidents/hjksb3ftp8sz.md) | critical | 2021-10-06 20:45 UTC | 2021-10-06 21:02 UTC | 17 min | resolved |
| [Substack is intermittently unavailable](https://rewindex.com/company/substack/incidents/1rltvvn8hfmt.md) | major | 2021-10-06 21:14 UTC | 2021-10-06 21:51 UTC | 37 min | resolved |
| [Substack](https://rewindex.com/company/substack/incidents/nhk7ks5bp8w3.md) | major | 2021-10-14 16:30 UTC | 2021-10-14 16:30 UTC | 0 min | resolved |
| [Publisher dashboards are unavailable](https://rewindex.com/company/substack/incidents/2ygctcf35zrl.md) | minor | 2021-10-15 17:16 UTC | 2021-10-15 20:30 UTC | 3.2 h | resolved |
| [Partial site outage](https://rewindex.com/company/substack/incidents/6q6mcsv3b5wh.md) | major | 2021-10-28 17:35 UTC | 2021-10-28 18:32 UTC | 57 min | resolved |

## Maintenance

| Incident | Impact (vendor label) | Started (UTC) | Resolved (UTC) | Duration | Status |
| --- | --- | --- | --- | --- | --- |
| [\[Scheduled\] Search Upgrades](https://rewindex.com/company/substack/incidents/vn5z0qhl3ry4.md) | maintenance | 2021-10-21 20:02 UTC | 2021-10-21 21:00 UTC | 58 min | resolved |

## Cite this

Substack posted 5 status incidents in October 2021 (4 major or critical); 0 price changes and 0 notable page changes observed.

- Canonical URL: https://rewindex.com/company/substack/2021/10
- Citation: Substack, “Substack in October 2021” (2021-10-01 00:00 UTC). Archived by Rewindex: https://rewindex.com/company/substack/2021/10 (CC BY 4.0).
- Markdown link: `[Substack: Substack in October 2021 (2021-10-01)](https://rewindex.com/company/substack/2021/10)`


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Canonical: https://rewindex.com/company/substack/2021/10 · Markdown: https://rewindex.com/company/substack/2021/10.md · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-11-04T10:18:06.340Z