Supported Features
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VoiceOver
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Dark Interface
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Reduced Motion
Vitamin D: Sun & UV Tracker
Sunlight, D3 & Deficiency
Free · In‑App Purchases
Know your real vitamin D from sunlight, tuned to your skin and location. Smart sun timing, UV alerts, and Apple Watch tracking. Make every minute of sun count.
Vitamin D: Sun & UV Tracker turns sunlight into clear, personal data. It works out when your skin can actually make vitamin D, so you get what you need from the sun and know the moment to cover up.
Most apps show a generic UV index. That is not enough to judge vitamin D. This app uses astronomy and live atmospheric data to estimate the UVB at your exact spot:
- Sun angle: real time solar altitude for your GPS location.
- Ozone: adjustments for current ozone density.
- Air clarity: aerosol filtering for a sharper read on usable sunlight.
Built for Apple Watch
- Window complications: keep today's vitamin D window on your watch face.
- Haptic alerts: a gentle tap when the sun angle is right where you are.
- Live progress: watch your dose add up without reaching for your phone.
Apple Health integration
- Your vitamin D from sun and your time in the sun log automatically to Apple Health, so the rest of your health apps see the full picture.
Personal by design
- Skin type: timing based on the Fitzpatrick scale to help you avoid burning.
- Anywhere on Earth: accurate at any latitude, with extra care for northern regions and short winter days.
- Calm interface: focused on your data, with nothing in the way.
Why people choose it
- Private: your health and location stay on your device. No account needed.
- Quiet: no ads and no noise, just a clean instrument.
- Light: easy on battery for iPhone and Apple Watch.
Stop guessing. Start measuring your sun.
Privacy Policy: https://experts-draw-9pm.craft.me/jhKYqLYOOaA3vi
Terms of Use: https://experts-draw-9pm.craft.me/i3cxOdfwgo2BQ7
Ratings & Reviews
New in this version:
- Smart Sun Safety: clear guidance on when to catch sun and when to cover up, from your very first day.
- Solar window alerts: a nudge when conditions are good for vitamin D where you are.
- Vitamin D reserve: see your level fill up like a battery through the day.
- Insights you can swipe: daily and long term views of your sun and supplement intake.
- Live session tracking and a smoother Apple Watch experience.
- More reliable Apple Health sync and more accurate readings.
Thank you for the reviews and feedback. Please keep it coming.
The developer, Uladzsislau Luchkouski, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Health & Fitness
- Location
- Other Data
The developer indicated that this app supports the following accessibility features. Learn More
Information
- Seller
- Uladzsislau Luchkouski
- Size
- 25.2 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 18.6 or later.
- iPhone
Requires iOS 18.6 or later. - Apple Watch
Requires watchOS 11.6 or later.
- iPhone
- Location
- This app may use your location even when it isn’t open, which can decrease device battery life.
- Languages
- English
- Age Rating
9+
- 9+
- Contains
Health or Wellness Topics
- In-App Purchases
Yes
- Premium Weekly $2.99
- Premium Yearly $49.99
- Copyright
- © 2026 IE Ulad Luch
