Rays: Auto Vitamin D Tracking

Content rating
Everyone
10+
Downloads
Content rating
Everyone
Learn more
Screenshot image
Screenshot image
Screenshot image
Screenshot image
Screenshot image
Screenshot image

About this app

Track Your Vitamin D Naturally
Vitamin D deficiency affects over 1 billion people worldwide, but monitoring your sun exposure shouldn't be complicated. Rays automatically tracks your vitamin D synthesis in the background, eliminating the need for manual logging.

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 an 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.
Rays is perfect for health-conscious individuals who want optimal vitamin D without the guesswork.

Try Rays 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
Updated on
Jun 25, 2026

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
Learn more about how developers declare sharing
No data collected
Learn more about how developers declare collection
Data is encrypted in transit
You can request that data be deleted

What’s new

1.42
Content rating
Everyone
Learn more

App support

Phone number
+16464500325
About the developer
Rays Health Technologies LLC
team@getraysapp.com
8 The Grn Ste B Dover, DE 19901-3618 United States
+1 646-450-0325