# Squarespace: Major incident: Acuity Scheduling Admin Mobile app crashing unexpectedly after iOS 27 update

**Summary:** A major Acuity Scheduling incident left the Admin Mobile app crashing on launch for some iOS 27 users; Android was unaffected. It ran from 2026-09-18 20:35 UTC to 2026-09-22 19:25 UTC (3 days 22 h). Access was restored, with the fix available in Acuity Scheduling version 98.0.0 via the Apple App Store. _(machine-written, sol)_
- Kind: Major incident · Label: outage (model (Jev))
- Changed: 2026-09-18 20:35 UTC · Detected: 2026-10-17 18:22 UTC
- [Source: https://stspg.io/t7pnt5m5vmsc](https://stspg.io/t7pnt5m5vmsc)
- [Company: Squarespace](https://rewindex.com/company/squarespace.md)
- Versions: before (none: first archived) → after incident\_version:260/kh77sr2kwjqg@3c9040f7c544
- Change 1 of 1 for this incident

## What changed

**1. Added: Title**

```diff
+ Acuity Scheduling Admin Mobile app crashing unexpectedly after iOS 27 update
```

**2. Added: Impact**

```diff
+ major
```

**3. Added: Status**

```diff
+ resolved
```

**4. Added: Start time**

```diff
+ 2026-09-18 20:35 UTC
```

**5. Added: Resolved time**

```diff
+ 2026-09-22 19:25 UTC
```

**6. Added: Affected components**

```diff
+ Acuity Scheduling
```

**7. Added: Update** (investigating) · 2026-09-18 20:35 UTC

```diff
+ Some users are experiencing issues with the Acuity Admin Mobile app crashing when attempting to launch the app after the latest iOS 27 update. We are currently investigating the issue.
```

**8. Added: Update** (investigating) · 2026-09-18 20:46 UTC

```diff
+ We currently recommend that users remain on iOS 26 and defer upgrading to iOS 27 until this issue is resolved. This precaution will ensure uninterrupted access to the Acuity Admin Mobile app. Android users remain unaffected.
```

**9. Added: Update** (identified) · 2026-09-20 16:57 UTC

```diff
+ The issue has been identified and we are working on a fix.
```

**10. Added: Update** (identified) · 2026-09-21 19:25 UTC

```diff
+ We are continuing to work on a fix for this issue.
```

**11. Added: Update** (resolved) · 2026-09-22 19:25 UTC

```diff
+ Access to the Acuity Scheduling app has been restored for users on iOS 27. Users can update to Acuity Scheduling version 98.0.0 via the Apple App Store to install the fix.
```

## History of this incident

| When (UTC) | Change | Label |
| --- | --- | --- |
| 2026-09-18 20:35 UTC | Major incident: Acuity Scheduling Admin Mobile app crashing unexpectedly after iOS 27 update (this change) | outage |

All Squarespace changes: [timeline](https://rewindex.com/company/squarespace/changes.md)
_Diff excerpts are shown on normalized text: dates, counters and tokens appear as ‹date›, ‹count›, ‹tok›; noise-only edits are hidden. Rewindex shows the changed passages, not a copy of the page._


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Canonical: https://rewindex.com/change/i65aec333f0dee3 · Markdown: https://rewindex.com/change/i65aec333f0dee3.md · JSON: https://rewindex.com/api/v1/changes/i65aec333f0dee3 · Generated 2026-10-18T02:28:09.341Z