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# fallbackURL

A URL that offers participants a way to identify or join the activity
from a web browser.

```
var fallbackURL: URL?
```

## Discussion

Use this property to provide fallback behavior for users who don’t have your app
installed on their device. For example, if your app runs only on iOS, use this
property to supply activity-related information for users on a Mac. When your app
isn’t available, the system opens the specified URL in Safari.

> Important: Make sure that the URL in this property eventually leads to a
> webpage with the same content as the activity. Safari automatically synchronizes
> media playback for listen-together and watch-together experiences.

---

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