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# SRDeviceUsageReport.ApplicationUsage

An object that describes the user’s app activity over a period of time.

```
class ApplicationUsage
```

## Overview

Each instance of this class represents an app in a particular app category. For more information, see [`applicationUsageByCategory`](/documentation/SensorKit/SRDeviceUsageReport/applicationUsageByCategory).

## Topics

### Identifying the App

[`bundleIdentifier`](/documentation/SensorKit/SRDeviceUsageReport/ApplicationUsage/bundleIdentifier)

The bundle identifier of the app in use.

[`reportApplicationIdentifier`](/documentation/SensorKit/SRDeviceUsageReport/ApplicationUsage/reportApplicationIdentifier)

A pseudonymn for a real application identifier.

[`supplementalCategories`](/documentation/SensorKit/SRDeviceUsageReport/ApplicationUsage/supplementalCategories)

Categories that provide more information about an app.

[`SRSupplementalCategory`](/documentation/SensorKit/SRSupplementalCategory)

A more detailed category that provides additional context to the app category.

### Timing App Use

[`usageTime`](/documentation/SensorKit/SRDeviceUsageReport/ApplicationUsage/usageTime)

The amount of time the user uses the app.

[`relativeStartTime`](/documentation/SensorKit/SRDeviceUsageReport/ApplicationUsage/relativeStartTime)

The time the user starts the app relative to the start time of the first app in a report interval.

### Inspecting Text Input

[`textInputSessions`](/documentation/SensorKit/SRDeviceUsageReport/ApplicationUsage/textInputSessions)

The text input session types that occur during application usage.

[`SRTextInputSession`](/documentation/SensorKit/SRTextInputSession)

The characters a user types for a particular keyboard.


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