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PRIVACY.md

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Privacy Policy for Sun Day

Last updated: January 2025

Overview

Sun Day is designed with your privacy in mind. We believe in transparency and want you to understand exactly how your data is used.

Data Collection and Usage

Location Data

  • What we collect: Your current location (latitude, longitude, altitude)
  • Why: To fetch UV index data for your specific location
  • How it's used: Coordinates are sent to Open-Meteo weather API to retrieve UV data
  • Storage: Not stored; only used in real-time

Health Data

  • What we collect:
    • Fitzpatrick skin type (if available in Apple Health)
    • Date of birth (to calculate age factor)
    • Vitamin D history (past 7-14 days for adaptation factor)
  • Why: To personalize vitamin D calculations
  • How it's used: Read from and written to Apple HealthKit
  • Storage: Stored securely in Apple Health on your device

User Preferences

  • What we collect: Your selected skin type, clothing level, age (if not from Health)
  • Why: To remember your preferences between app sessions
  • Storage: Stored locally on your device using UserDefaults

Third-Party Services

Open-Meteo API

  • What we share: Location coordinates only
  • Purpose: Retrieve UV index and weather data
  • Their privacy: No authentication required, no personal data collected
  • More info: https://open-meteo.com/en/terms

Farmsense API

  • What we share: Current timestamp only
  • Purpose: Display moon phase
  • Their privacy: No authentication required, no personal data collected
  • More info: https://www.farmsense.net/

Data Storage

  • All data stays on your device
  • No cloud storage or accounts
  • No analytics or tracking
  • No advertising identifiers

Permissions

Location (Required)

Used solely to fetch UV data for your current position

Health (Optional)

  • Read: Skin type, date of birth, vitamin D history
  • Write: Vitamin D intake from sun exposure

Notifications (Optional)

Local notifications only for:

  • Sunrise/sunset times
  • Sun exposure warnings

Data Sharing

We do not:

  • Collect personal information
  • Track your usage
  • Share data with advertisers
  • Store data on external servers
  • Use analytics services

Children's Privacy

Sun Day does not knowingly collect data from children under 13. The app is designed for general use with health calculations suitable for all ages.

Changes to This Policy

Any updates to this privacy policy will be reflected in the app's next update with an updated "Last updated" date.

Open Source

Sun Day is open source. You can review the entire codebase at: https://github.com/jackjackbits/sunday

Contact

For privacy questions or concerns:

  • Create an issue on GitHub
  • The app is provided as-is with no warranty

Your Rights

You can:

  • Deny location access (app will use estimated data)
  • Deny health access (manually enter data)
  • Delete the app to remove all local data
  • Review all code since it's open source

This privacy policy is released into the public domain alongside the app code.