Helia: Vitamin D Tracker

Helia makes the invisible chemistry of sunlight visible. It estimates the vitamin D you make from the sun and take from supplements and food, fills a daily target like a budget, and tells you the smartest, safest way to top it up. YOUR DAY, IN ONE NUMBER • Today's vitamin D vs. your target, split by sun and supplements • A live sky background that follows the time of day and real weather • An hourly UV curve and a sun-path arc GET SUN SAFELY • A live sun-session timer with a real-time IU ticker and a sunburn (MED) gauge • Haptic milestones and a warning before you burn • The best window to get sun today — or when to just take a supplement instead • A Live Activity and Dynamic Island that track the session while you're outside CONNECTED • Reads time-in-daylight and outdoor workouts from Apple Health; writes your doses back • Home Screen and Lock Screen widgets for vitamin D, UV index and…