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# openDefaultApplicationsSettingsURLString

The URL string used to select a default app in the Settings app.

```
nonisolated class let openDefaultApplicationsSettingsURLString: String
```

## Discussion

Create a URL from this value and pass it to the [`open(_:options:completionHandler:)`](/documentation/UIKit/UIApplication/open(_:options:completionHandler:)) method to launch the Settings app and display your app’s custom settings, if it has any:

```swift
// Create the URL that links to the Settings app for default app selection.
if let url = URL(string: UIApplication.openDefaultApplicationsSettingsURLString) {
    // Ask the system to open that URL.
    await UIApplication.shared.open(url)
}
```

For design guidance, see Human Interface Guidelines > [Settings](https://developer.apple.com/design/human-interface-guidelines/).

---

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