--- title: "Rays: Auto Vitamin D Tracking - Reviews, Revenue and Downloads in United States | Apple App Store" description: "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 tra" --- # Rays: Auto Vitamin D Tracking — United States > Auto sun exposure tracking ![Rays App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple211/v4/44/49/c0/4449c039-ff6c-eadd-a66d-3a542da24209/AppIcon-0-0-1x_U007ephone-0-1-85-220.png/434x0w.png) **Developer:** [Rays Health Technologies](https://apptail.io/developer/rays-health-technologies-IJXoab) **Category:** Health Fitness **Rating:** 4.4/5 (7 ratings) **Price:** Free **Bundle ID:** com.getrays.rayspublic **Store:** Apple App Store **Country:** United States **Version:** 1.46 (released 2026-11-01) **Original Release:** 2025-09-18 **Languages:** English **App Store Link:** [Download on Apple App Store](https://apps.apple.com/us/app/app/id6752499967) **AppTail Page:** [https://apptail.io/app/rays-auto-vitamin-d-tracking-BLkx/united-states](https://apptail.io/app/rays-auto-vitamin-d-tracking-BLkx/united-states) ## Rays Description 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: Privacy Policy: Health Disclaimer: ## Rays Screenshots - [Screenshot 1](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/eb/66/ca/eb66ca34-816f-3279-dac4-d03ed557b25b/iphone1__U00281_U0029.jpg/1290x2796.png) - [Screenshot 2](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/df/42/a0/df42a073-5463-d960-8e5f-d5d693a8da20/iphone2.jpg/1290x2796.png) - [Screenshot 3](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/96/38/dd/9638dd39-bd8e-abe8-93c2-fcd2f541c5ab/iphone3.jpg/1290x2796.png) - [Screenshot 4](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/3d/b3/50/3db35024-9a22-6509-161d-9176c8d566dd/iphone4.jpg/1290x2796.png) - [Screenshot 5](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/71/8a/7b/718a7b9b-b2c9-1cd7-22f6-ab04ed91b45f/iphone_5__U00281_U0029.jpg/1290x2796.png) - [Screenshot 6](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/c1/a9/24/c1a92435-9382-25a6-7b51-8cc69c71ae92/iphone7.jpg/1290x2796.png) ## Rays Rating Breakdown in United States - 5 stars: 6 (86%) - 4 stars: 0 (0%) - 3 stars: 0 (0%) - 2 stars: 0 (0%) - 1 stars: 1 (14%) ## Rays Reviews in United States ### ***** "Game-Changer for daily wellbeing!" I’ve rarely thought about the impact of Vitamin D on my overall daily wellbeing - Rays has made it possible to get the most of my time. It’s simple, informative, and clean UI have led to major improvements in my overall happiness! -- YogiMan2025, 2025-12-12 ### ***** "5 star" I wish I had started tracking my Vitamin D levels sooner. I’m already seeing an improvement in energy thanks to Rays. -- Frogmeat75, 2025-12-12 [View all Rays reviews and detailed analytics on AppTail](https://app.apptail.io/signup?utm_campaign=ai-crawl&utm_content=reviews) ## Rays In-App Purchases | Item | Price | |------|-------| | Rays - Auto Vitamin D Tracker | $59.99 | ## Apps Similar to Rays - [HeartBreath HRV](https://apptail.io/app/heartbreath-hrv-hpNb/united-states) - [My Endorphin](https://apptail.io/app/my-endorphin-lnrc/united-states) - [BalancePod](https://apptail.io/app/balancepod-DuZc/united-states) - [Home Balance Test](https://apptail.io/app/home-balance-test-wGTd/united-states) - [Balance by NIH Toolbox V3](https://apptail.io/app/balance-by-nih-toolbox-v3-Cran/united-states) - [Kalorien Zähler & Gym: Muscles](https://apptail.io/app/kalorien-zahler-gym-muscles-GWan/united-states) - [UV Index, Vitamin D & Sunburn](https://apptail.io/app/uv-index-vitamin-d-sunburn-txTn/united-states) - [SunSeek: Sunlight & Vitamin D](https://apptail.io/app/sunseek-sunlight-vitamin-d-pRnu/united-states) - [Sun by Biomind](https://apptail.io/app/sun-by-biomind-ftSw/united-states) - [Calcium & Vitamin D tracker](https://apptail.io/app/calcium-vitamin-d-tracker-UMex/united-states) ## Rays Available In - [United States](https://apptail.io/app/rays-auto-vitamin-d-tracking-BLkx/united-states) - [United Kingdom](https://apptail.io/app/rays-auto-vitamin-d-tracking-BLkx/united-kingdom) - [Australia](https://apptail.io/app/rays-auto-vitamin-d-tracking-BLkx/australia) - [Azerbaijan](https://apptail.io/app/rays-auto-vitamin-d-tracking-BLkx/azerbaijan) - [Belgium](https://apptail.io/app/rays-auto-vitamin-d-tracking-BLkx/belgium) - [Bulgaria](https://apptail.io/app/rays-auto-vitamin-d-tracking-BLkx/bulgaria) - [Belarus](https://apptail.io/app/rays-auto-vitamin-d-tracking-BLkx/belarus) - [Canada](https://apptail.io/app/rays-auto-vitamin-d-tracking-BLkx/canada) - [Chile](https://apptail.io/app/rays-auto-vitamin-d-tracking-BLkx/chile) - [Czechia](https://apptail.io/app/rays-auto-vitamin-d-tracking-BLkx/czechia) - [Germany](https://apptail.io/app/rays-auto-vitamin-d-tracking-BLkx/germany) - [Denmark](https://apptail.io/app/rays-auto-vitamin-d-tracking-BLkx/denmark) - [Dominican Republic](https://apptail.io/app/rays-auto-vitamin-d-tracking-BLkx/dominican-republic) - [Algeria](https://apptail.io/app/rays-auto-vitamin-d-tracking-BLkx/algeria) - [Ecuador](https://apptail.io/app/rays-auto-vitamin-d-tracking-BLkx/ecuador) - [Egypt](https://apptail.io/app/rays-auto-vitamin-d-tracking-BLkx/egypt) - [Spain](https://apptail.io/app/rays-auto-vitamin-d-tracking-BLkx/spain) - [Finland](https://apptail.io/app/rays-auto-vitamin-d-tracking-BLkx/finland) - [France](https://apptail.io/app/rays-auto-vitamin-d-tracking-BLkx/france) - [Ghana](https://apptail.io/app/rays-auto-vitamin-d-tracking-BLkx/ghana) - [Hong Kong SAR China](https://apptail.io/app/rays-auto-vitamin-d-tracking-BLkx/hong-kong) - [Honduras](https://apptail.io/app/rays-auto-vitamin-d-tracking-BLkx/honduras) - [Hungary](https://apptail.io/app/rays-auto-vitamin-d-tracking-BLkx/hungary) - [Ireland](https://apptail.io/app/rays-auto-vitamin-d-tracking-BLkx/ireland) - [Israel](https://apptail.io/app/rays-auto-vitamin-d-tracking-BLkx/israel) - [Italy](https://apptail.io/app/rays-auto-vitamin-d-tracking-BLkx/italy) - [Jamaica](https://apptail.io/app/rays-auto-vitamin-d-tracking-BLkx/jamaica) - [Jordan](https://apptail.io/app/rays-auto-vitamin-d-tracking-BLkx/jordan) - [Kenya](https://apptail.io/app/rays-auto-vitamin-d-tracking-BLkx/kenya) - [South Korea](https://apptail.io/app/rays-auto-vitamin-d-tracking-BLkx/south-korea) - [Kazakhstan](https://apptail.io/app/rays-auto-vitamin-d-tracking-BLkx/kazakhstan) - [Sri Lanka](https://apptail.io/app/rays-auto-vitamin-d-tracking-BLkx/sri-lanka) - [Luxembourg](https://apptail.io/app/rays-auto-vitamin-d-tracking-BLkx/luxembourg) - [Mali](https://apptail.io/app/rays-auto-vitamin-d-tracking-BLkx/mali) - [Macao SAR China](https://apptail.io/app/rays-auto-vitamin-d-tracking-BLkx/macau) - [Malta](https://apptail.io/app/rays-auto-vitamin-d-tracking-BLkx/malta) - [Mauritius](https://apptail.io/app/rays-auto-vitamin-d-tracking-BLkx/mauritius) - [Norway](https://apptail.io/app/rays-auto-vitamin-d-tracking-BLkx/norway) - [New Zealand](https://apptail.io/app/rays-auto-vitamin-d-tracking-BLkx/new-zealand) - [Oman](https://apptail.io/app/rays-auto-vitamin-d-tracking-BLkx/oman) - [Panama](https://apptail.io/app/rays-auto-vitamin-d-tracking-BLkx/panama) - [Peru](https://apptail.io/app/rays-auto-vitamin-d-tracking-BLkx/peru) - [Philippines](https://apptail.io/app/rays-auto-vitamin-d-tracking-BLkx/philippines) - [Pakistan](https://apptail.io/app/rays-auto-vitamin-d-tracking-BLkx/pakistan) - [Portugal](https://apptail.io/app/rays-auto-vitamin-d-tracking-BLkx/portugal) - [Paraguay](https://apptail.io/app/rays-auto-vitamin-d-tracking-BLkx/paraguay) - [Qatar](https://apptail.io/app/rays-auto-vitamin-d-tracking-BLkx/qatar) - [Russia](https://apptail.io/app/rays-auto-vitamin-d-tracking-BLkx/russia) - [Saudi Arabia](https://apptail.io/app/rays-auto-vitamin-d-tracking-BLkx/saudi-arabia) - [Singapore](https://apptail.io/app/rays-auto-vitamin-d-tracking-BLkx/singapore) - [Slovakia](https://apptail.io/app/rays-auto-vitamin-d-tracking-BLkx/slovakia) - [Senegal](https://apptail.io/app/rays-auto-vitamin-d-tracking-BLkx/senegal) - [Suriname](https://apptail.io/app/rays-auto-vitamin-d-tracking-BLkx/suriname) - [Thailand](https://apptail.io/app/rays-auto-vitamin-d-tracking-BLkx/thailand) - [Tunisia](https://apptail.io/app/rays-auto-vitamin-d-tracking-BLkx/tunisia) - [Türkiye](https://apptail.io/app/rays-auto-vitamin-d-tracking-BLkx/turkey) - [Uganda](https://apptail.io/app/rays-auto-vitamin-d-tracking-BLkx/uganda) - [Angola](https://apptail.io/app/rays-auto-vitamin-d-tracking-BLkx/angola) - [Vietnam](https://apptail.io/app/rays-auto-vitamin-d-tracking-BLkx/vietnam) - [Argentina](https://apptail.io/app/rays-auto-vitamin-d-tracking-BLkx/argentina) --- ## About AppTail [AppTail](https://apptail.io) is a mobile app intelligence platform providing app analytics, ASO (App Store Optimization) tools, keyword tracking, competitor analysis, revenue estimates, and review monitoring for iOS App Store apps. Track your app's performance, discover ranking keywords, monitor competitors, and analyze market trends. - [Search Apps](https://apptail.io) - [Top Charts](https://apptail.io/top-iphone-apps) - [Sign Up for Full Access](https://app.apptail.io/signup?utm_campaign=ai-crawl&utm_content=footer) *Data provided by [AppTail](https://apptail.io) - Mobile App Intelligence Platform*