Rays: Auto Vitamin D Tracking
Rays Health Technologies LLC Health & Fitness iPhoneiPadiPod touch
Rays: Auto Vitamin D Tracking is a free Health & Fitness app for iPhone and iPad by Rays Health Technologies LLC. Rated 4.4/5 from 7 ratings.
- Rating
- 4.4
- 7 ratings
- Price
- Free
- on the App Store
- Size
- 58 MB
- Age 4+
- Updated
- Aug 28
- 2026 · v1.45
Screenshots
About Rays: Auto Vitamin D Tracking
Never Worry About Vitamin D Again Over 1 billion people are vitamin D deficient, but knowing if you’re getting enough sun shouldn’t be complicated. Rays is the world’s first app that automatically tracks your vitamin D synthesis, so you can spend your time enjoying life. No manual logging, no thinking required. Why Vitamin D Matters Optimal vitamin D levels support natural energy, balanced mood, healthy sleep cycles, and radiant skin. With Rays’ precise tracking, you can maintain these benefits year-round without guesswork or overdoing it. Automatic Vitamin D Tracking Rays uses a first-of-its-kind outdoor detection system combining GPS precision patterns, sensor data, movement analysis, and personalized machine learning that adapts to your routines. With high accuracy and minimal battery usage, it works seamlessly in the background without any manual input. Personalized Health Intelligence Our algorithm analyzes your skin type (Fitzpatrick Scale I-VI), age, geographic location, supplement intake, and lifestyle factors. Based on Endocrine Society Clinical Practice Guidelines, we provide recommendations as precise as your doctor’s, but as convenient as checking the weather. Smart Recommendations Receive personalized guidance like “Get 18 minutes at 11 AM tomorrow” based on real-time UV index, cloud cover, solar positioning, and your personal synthesis rate. Our intelligent engine suggests optimal timing when UV will be 2-3x more efficient for vitamin D production. Advanced Progress Tracking Monitor your vitamin D synthesis with detailed weekly charts, streak tracking, and comprehensive health insights. Seamlessly syncs with Apple Health and automatically adjusts for seasonal variations while preventing excessive intake when combined with supplements. For Tanners & Sun Enthusiasts Already spending time in the sun for a tan? Put that exposure to work. Rays tracks your cumulative UV dose so you can optimize your color, avoid overexposure, and know exactly where you stand — all automatically. Rays is perfect for health-conscious individuals who want optimal vitamin D without the guesswork. Try Rays free for 3 days with full access to all features. Terms of Use: https://getrays.app/eula Privacy Policy: https://getrays.app/privacy Health Disclaimer: https://getrays.app/health-disclaimer
Ratings & reviews
4.4
7 ratings
What’s new
Version 1.45 · Updated August 28, 2026
- Bug fixes
App privacy
The developer, Rays Health Technologies LLC, reported these privacy practices to Apple.
Data Linked to You
The following data, which may be collected and linked to your identity, may be used for the following purposes:
- Usage Data: Product Interaction
- Diagnostics: Crash Data
- Health & Fitness: Health, Fitness
- Location: Coarse Location
- Contact Info: Email Address, Name
- Identifiers: User ID, Device ID
Used for: Analytics, App Functionality
Alternatives to Rays: Auto Vitamin D Tracking
Looking for apps like Rays: Auto Vitamin D Tracking? Here are 6 similar apps on the App Store. The highest rated is Vitamin D Window Widget (5.0/5), and all 6 are free to download.
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Vitamin D Window Widget
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RayDay: Vitamin D Tracker
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Vitamin D Sun Tracker - Bask
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SunMax: Vitamin D Tracker
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Vitamin D Sun Tracker & UV
5.0
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SunSeek: Sunlight & Vitamin D
4.8
| App | Rating | Price | Last updated | Compare |
|---|---|---|---|---|
| Rays: Auto Vitamin D Tracking | 4.4 / 5 (7 ratings) | Free | August 28, 2026 | |
| Vitamin D Window Widget | 5.0 / 5 (2) | Free | Aug 12, 2026 | Compare |
| RayDay: Vitamin D Tracker | 3.0 / 5 (2) | Free | Sep 25, 2026 | Compare |
| Vitamin D Sun Tracker - Bask | 4.7 / 5 (24) | Free | Jul 9, 2026 | Compare |
| SunMax: Vitamin D Tracker | – | Free | Aug 28, 2026 | Compare |
| Vitamin D Sun Tracker & UV | 5.0 / 5 (16) | Free | Oct 3, 2026 | Compare |
| SunSeek: Sunlight & Vitamin D | 4.8 / 5 (145) | Free | Sep 26, 2026 | Compare |