Vitamin D: Sun & UV Tracker

About this app

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

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.

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1. First observed Aug 7, 2026 · 9:40 AM Free