---
title: isUsable
framework: Local Authentication
role: symbol
role_heading: Instance Property
platforms: [iOS 18.0+, iPadOS 18.0+, Mac Catalyst 18.0+, macOS 15.0+, visionOS 2.0+, watchOS 11.0+]
path: localauthentication/laenvironment/mechanism/isusable
---

# isUsable

## Declaration

```swift
var isUsable: Bool { get }
```

## Discussion

Discussion Whether the mechanism is available for use, i.e. whether the relevant preflight call of @c canEvaluatePolicy would succeed. properties of the subclass to determine why mechanism can’t be used.