---
title: HealthKit Constants
framework: healthkit
role: collectionGroup
role_heading: API Collection
path: healthkit/healthkit-constants
---

# HealthKit Constants

## Topics

### Constants

- [HKDataTypeIdentifierStateOfMind](healthkit/hkdatatypeidentifierstateofmind.md)
- [HKMetadataKeyAppleFitnessPlusCatalogIdentifier](healthkit/hkmetadatakeyapplefitnesspluscatalogidentifier.md)
- [HKMetadataKeyMaximumLightIntensity](healthkit/hkmetadatakeymaximumlightintensity.md)
- [HKPredicateKeyPathWorkoutEffortRelationship](healthkit/hkpredicatekeypathworkouteffortrelationship.md)

## See Also

### Reference

- [HealthKit Enumerations](healthkit/healthkit-enumerations.md)
- [HealthKit Classes](healthkit/healthkit-classes.md)
- [HealthKit Data Types](healthkit/healthkit-data-types.md)
- [HealthKit Functions](healthkit/healthkit-functions.md)
- [Macros](healthkit/healthkit-macros.md)
- [HealthKit Variables](healthkit/healthkit-variables.md)