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# isMacCatalystApp

A Boolean value that indicates whether the process originated as an iOS app and runs on macOS.

```
var isMacCatalystApp: Bool { get }
```

## Discussion

The value of this property is <doc://com.apple.documentation/documentation/Swift/true> when the process is:

- A Mac app built with Mac Catalyst, or an iOS app running on Apple silicon.
- Running on a Mac.

Frameworks that support iOS and macOS use this property to determine if the process is a Mac app built with Mac Catalyst. To conditionally compile source code intended to run only in macOS, use `#if targetEnvironment(macCatalyst)` (or `#if TARGET_OS_MACCATALYST` in Objective-C) instead.

> Note:
> To distinguish between an iOS app running on Apple silicon and a Mac app built with Mac Catalyst, use the ``doc://com.apple.foundation/documentation/Foundation/ProcessInfo/isiOSAppOnMac`` property.

---

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