Helia: Vitamin D Tracker

Know your vitamin D from sun and supplements, when it's safe to go out, and how close you are to sunburn — with a live blood-level estimate. On-device and private.

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 time in daylight • An Apple Watch app with three complications • Siri and Shortcuts: log a dose, start a sun session, or ask where you stand • Optional iCloud sync across your devices

HELIA PRO • Month and quarter history • Your modelled blood 25-OH-D level, calibrated to lab results you enter • Watch auto-tracking • Custom alerts and Share Studio — turn your sunlight into a card or a video

PRIVATE BY DESIGN Your records stay on device with optional iCloud sync; Health data is read live and never uploaded; location is coarse and never stored precisely. No ads, no trackers. Free to use, with an optional Pro upgrade.

Helia provides estimates, not medical advice, and is not a medical device. Consult a qualified clinician.

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