Sleepcraft Privacy Policy

Last Updated: December 18, 2025

 

Overview

Sleepcraft ("we," "our," or "the app") is committed to protecting your privacy. This Privacy Policy explains how we handle your personal information and health data.

 

Information We Collect

Health Data from Apple Health

Sleepcraft requests read-only access to the following health data from Apple Health:

  • Sleep analysis data (sleep stages, duration, timing)
  • Heart rate data
  • Heart rate variability (HRV)
  • Step count
  • Active energy burned

 

User-Provided Information

  • Date of birth (age) - for age-specific sleep scoring algorithms
  • Biological sex - for sex-specific sleep scoring algorithms
  • Subjective sleep quality ratings (1-10 scale)
  • Sleep factors (user-tagged influences like "Late Coffee," "Exercise")

 

Information We Do Not Collect

  • We do not collect your name, email address, or contact information
  • We do not create user accounts
  • We do not use analytics or tracking services
  • We do not collect device identifiers or location data

 

How We Use Your Information

All health data processing occurs entirely on your device. We use your health data to:

  • Calculate personalized sleep quality scores using medical research-based algorithms
  • Display sleep stage visualizations and patterns
  • Track sleep metrics over time (duration, deep sleep, REM sleep, etc.)
  • Provide insights and predictions about your sleep quality
  • Compare your metrics to age and sex-specific norms from medical research (NHS, CDC, National Sleep Foundation, AASM)

 

Data Storage

  • Local Storage Only: All your health data and app data are stored exclusively on your device using Apple's secure local storage (UserDefaults and HealthKit)
  • iCloud Sync (Optional): If enabled, your user settings, subjective ratings, factors, and insights are synced across your Apple devices using iCloud Key-Value Storage. This sync is end-to-end encrypted by Apple
  • No External Servers: We do not transmit, upload, or store your data on any external servers
  • No Third-Party Sharing: Your health data is never shared with third parties

 

Your Data Rights

You have complete control over your data:

  • Access: All your data is accessible directly within the app
  • Deletion: You can delete all app data from the Settings screen
  • HealthKit Permissions: You can revoke HealthKit access at any time in iOS Settings → Health → Data Access & Devices → Sleepcraft
  • iCloud Sync: You can disable iCloud sync in iOS Settings → [Your Name] → iCloud → Sleepcraft

Data Security

  • All health data remains in Apple's secure HealthKit database
  • App-specific data (ratings, factors, insights) is stored locally on your device or in your personal iCloud account
  • We use Apple's built-in security features to protect your data
  • No data is transmitted over the internet (except for optional iCloud sync, which uses Apple's encryption)

 

Children's Privacy

Sleepcraft does not knowingly collect data from children under 13. The app is designed for adults aged 18 and above who want to track and improve their sleep health.

 

Medical Disclaimer

Sleepcraft is designed for general wellness and informational purposes only. It is not intended to diagnose, treat, cure, or prevent any disease or medical condition. The sleep scores and insights provided are based on general medical research and should not be considered medical advice. Always consult with a qualified healthcare professional for medical concerns.

Research Sources

Our sleep scoring algorithms are based on peer-reviewed research and guidelines from:

  • National Health Service (NHS)
  • Centers for Disease Control and Prevention (CDC)
  • National Sleep Foundation
  • American Academy of Sleep Medicine (AASM)
  • Peer-reviewed sleep medicine research published in academic journals

Changes to This Privacy Policy

We may update this Privacy Policy from time to time. The "Last Updated" date at the top indicates when the policy was last revised. Continued use of the app after changes constitutes acceptance of the updated policy.

Contact Us

If you have questions about this Privacy Policy or how Sleepcraft handles your data, you can contact us at:

Email: nfabrika@gmail.com

Summary: Sleepcraft analyzes your Apple Health sleep data entirely on your device. Your health data never leaves your device, except for optional iCloud sync across your own devices. We do not collect personal information, use analytics, or share data with third parties.