D3-Sync: Sun & Supplements
Track Vit D from Sun & Diet
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
New: Live Activities for active sun sessions, Apple Watch ring, and a privacy-first design.
Track your daily Vitamin D3 from sun exposure and supplements — privately, on-device.
D3-Sync estimates how much Vitamin D you synthesize while you're outside, based on your skin type, the local UV index, and how much skin you have exposed. Add supplements with one tap. See your daily total on the dashboard, home-screen widget, Lock Screen widget, Apple Watch, and the Live Activity / Dynamic Island during active sun sessions.
FREE FEATURES
• Real-time UV index for your location
• Manual supplement logging in IU
• Daily progress ring with goal
• Small home-screen widget
• Apple Watch progress ring + supplement logging
• Apple Health integration (read & write Vitamin D)
PRO (subscription or lifetime)
• Active sunbathing timer with sunburn-prevention safety
• Live Activity & Dynamic Island for live sessions
• Passive background tracking (no timer required)
• Smart sun-window alerts using forecast UV
• Lock-Screen widgets and the medium home-screen widget
• Apple Watch UV insights and advanced complications
• Weekly & monthly trends with Apple Health comparison
• CSV history export for your healthcare provider
• On-device skin type analyzer (camera + Vision)
• Removal of all advertising
PRIVACY
Your skin profile, location, and Health data stay on your device or in your private iCloud. We never sell or share personal data. Ads (free tier only) use Apple's privacy-preserving SKAdNetwork.
DISCLAIMER
D3-Sync provides estimates and is not medical advice. Always consult a qualified healthcare professional before changing supplementation, sun exposure, or treatment.
Terms of Use (EULA): https://bigkrzyh.github.io/D3-Sync/terms.html
Privacy Policy: https://bigkrzyh.github.io/D3-Sync/privacy.html
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, Krzysztof Kuzmicki, 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 Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Identifiers
Data Linked to You
The following data may be collected and linked to your identity:
- Identifiers
- Usage Data
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Krzysztof Kuzmicki
- Size
- 7.1 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 18.6 or later.
- iPhone
Requires iOS 18.6 or later. - iPad
Requires iPadOS 18.6 or later. - Mac
Requires macOS 15.6 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 2.6 or later. - Apple Watch
Requires watchOS 10.0 or later.
- iPhone
- Location
- This app may use your location even when it isn’t open, which can decrease device battery life.
- Languages
English and 9 more
- English, French, German, Italian, Japanese, Polish, Portuguese, Russian, Simplified Chinese, Spanish
- Age Rating
9+
- 9+
- Contains
Advertising
Health or Wellness Topics
- In-App Purchases
Yes
- D3-Sync Pro Lifetime $49.99
- Yearly $19.99
- Monthly $2.99
- Copyright
- © Krzysztof Kuźmicki