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# Xcode 27.1 Beta Release Notes

Update your apps to use new features, and test your apps against API changes.

## Overview

Xcode 27.1 beta includes Swift 6.4 and SDKs for iOS 27.1, iPadOS 27.1, tvOS 27, watchOS 27, macOS 27, and visionOS 27.
Xcode 27.1 beta supports on-device debugging in iOS 17 and later, tvOS 17 and later, watchOS 10 and later, and visionOS.
Xcode 27.1 beta requires a Mac running macOS Tahoe 26.6 or later.

See [Xcode Support](https://developer.apple.com/support/xcode/) to learn more about compatible platforms and deployment targets.

### Mac Catalyst

#### Known Issues

- Projects that use APIs specific to iOS 27.1 show compile errors when building for Mac Catalyst (“undeclared identifier”, “not found”, “has no member”, “cannot find”, etc).
  (185924957)
  
  **Workaround:** Use build-time conditionals like `#if !targetEnvironment(macCatalyst)` (Swift) or `#if !TARGET_OS_MACCATALYST` (ObjC) to isolate affected code.
- Projects that target iOS 27.1 show no Mac Catalyst run destination available.
  (187046347)
  
  **Workaround:** Add a Mac Catalyst 27.0 minimum deployment in target settings.

### Previews

#### New Features

- The canvas overrides picker now includes a Display group for previewing content on a device’s alternative display.
  (182598534)

### Simulator

#### Known Issues

- Initial Simulator launch can take several minutes.
  (187708500)
- StandBy is unavailable in the iPhone Duo Simulator runtime.
  (187708663)
- Running and debugging most app extensions is unavailable in the iPhone Duo Simulator runtime.
  (187708767)

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