Privacy Policy

Vitamin D · Last updated July 2026

Vitamin D keeps health data and sun-session history on your device. There are no accounts, no ads, and no tracking — your coordinates are sent only to look up the local UV index, and your health data never leaves your iPhone.

No accounts No ads No tracking No analytics

What the app uses

Location

• What: your current coordinates (latitude, longitude, altitude).
• Why: to fetch the UV index for your exact position.
• How: coordinates are sent to the Open-Meteo weather API to retrieve UV and forecast data. The app stores your last known coordinates and cached UV data only on your device for offline use.

Health data

• What: your Fitzpatrick skin type and date of birth, only if you allow access.
• Why: to make the vitamin D estimate personal to you.
• How: read-only access from Apple HealthKit. The app does not write estimated sunlight exposure to HealthKit. Health data is never transmitted by the app.

Sun session history

• What: session start/end time, estimated IU, UV level, clothing level, and skin type.
• Why: to show today's total and calculate the recent-exposure factor.
• How: stored only in the app's local database. Deleting the app removes it.

Preferences

• What: your selected skin type, clothing level, SPF, and age (if not read from Health).
• Why: to remember your setup between sessions.
• How: stored locally on your device.

Third-party services

Two free public APIs are used. Neither requires an account and neither receives personal identifiers:

• Open-Meteo — receives your location coordinates to return UV and weather data. Terms.
• Farmsense — receives a timestamp to return the current moon phase. Site.

Permissions

• Location (required): used solely to fetch UV data for your position.
• Health (optional): read-only access to skin type and date of birth; writes nothing.
• Notifications (optional): local reminders only — sunrise, sunset, and solar noon.

What we never do

• Create accounts or identity profiles.
• Track your usage or use advertising identifiers.
• Share your data with advertisers or store health/session data on external servers.
• Use third-party analytics.

Your choices

• Deny location access — the app can show cached UV data when available, but cannot refresh local UV data.
• Deny health access — enter your details manually.
• Delete the app to remove all local data.

Children

Vitamin D does not knowingly collect data from children under 13. The app is designed for general use, with calculations suitable for all ages.

Changes

Any update to this policy will appear here with a revised "Last updated" date.

Contact

Questions about your privacy? Email marcos@thevisualizer.ai.