---
title: sourceAppIdentifier
framework: networkextension
role: symbol
role_heading: Instance Property
path: networkextension/nefilterflow/sourceappidentifier
---

# sourceAppIdentifier

A string containing the identifier of the source app of the flow.

## Declaration

```swift
var sourceAppIdentifier: String? { get }
```

## Discussion

Discussion This identifier remains the same for all versions and builds of the app and is unique among all apps.

## See Also

### Source app identification

- [sourceAppUniqueIdentifier](networkextension/nefilterflow/sourceappuniqueidentifier.md)
- [sourceAppVersion](networkextension/nefilterflow/sourceappversion.md)
- [sourceAppAuditToken](networkextension/nefilterflow/sourceappaudittoken.md)
- [sourceProcessAuditToken](networkextension/nefilterflow/sourceprocessaudittoken.md)