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# HKUpdateFrequency

Constants that determine how often the system launches your app in response to changes to HealthKit data.

```
enum HKUpdateFrequency
```

## Overview

For more information, see [`HKObserverQuery`](/documentation/HealthKit/HKObserverQuery).

## Topics

### Constants

[`HKUpdateFrequency.immediate`](/documentation/HealthKit/HKUpdateFrequency/immediate)

The system launches your app every time it detects a change.

[`HKUpdateFrequency.hourly`](/documentation/HealthKit/HKUpdateFrequency/hourly)

The system launches your app at most once an hour in response to changes.

[`HKUpdateFrequency.daily`](/documentation/HealthKit/HKUpdateFrequency/daily)

The system launches your app at most once a day in response to changes.

[`HKUpdateFrequency.weekly`](/documentation/HealthKit/HKUpdateFrequency/weekly)

The system launches your app at most once per week in response to changes.


---

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