D vs D3

Know exactly how much vitamin D you're getting. Every day. D-Fine tracks your vitamin D from three sources — sunlight, food, and supplements — and tells you if it's enough, based on your skin, your location, and the time of day. THE PROBLEM Vitamin D deficiency is one of the most common in the world, even among people who spend time outdoors. The issue isn't laziness. It's that no one can tell how much sun they actually need. It depends on where you live, the time of day, your skin type, what you're wearing. You can't figure that out by feel. THREE SOURCES, ONE NUMBER Until now, there was no way to see all the sources of vitamin D together. D-Fine combines sunlight, food, and supplements into a single daily figure — your IU today versus your personalized daily target. If you're taking a supplement, you'll finally know whether it's the right dose for you, today, in this season. WHAT D-FINE DOES Sunlight — D-Fine reads your time in daylight from your iPhone and Apple Watch, then calculates the IU your skin actually synthesized, factoring in UV index, sun angle, cloud cover, your Fitzpatrick skin type, how much skin is exposed, and any SPF you logged. Food — Log meals containing vitamin D. D-Fine adds the IU to your daily total. Supplements — Track your daily supplement dose. D-Fine warns you before you cross safe thresholds. WHO IT'S FOR People who live far from the equator, work indoors, have darker skin, are over 50, or just want to stop guessing. PRIVACY All processing happens on your device. Your profile syncs through your private iCloud container — only you can read it. Anonymous usage data is strictly opt-in (default OFF), uses a non-persistent install ID, and contains no Apple identifiers or personal information. APPLE WATCH With an Apple Watch, D-Fine measures your Time in Daylight continuously and passively, the way Apple intended. Without it, the app falls back to estimating from outdoor workouts and UV conditions — still useful, just less precise. D-Fine is not a medical device. It's a science-based calculation tool to help you understand your vitamin D intake. For medical concerns, talk to your doctor. Privacy Policy: https://d-fine.app/privacy Support: https://d-fine.app/support

Track your daily Vitamin D3 from sun exposure and supplements — privately, on-device. D3-Sync estimates how much Vitamin D you synthesize while you're outside, based on your skin type, the local UV index, and how much skin you have exposed. Add supplements with one tap. See your daily total on the dashboard, home-screen widget, Lock Screen widget, Apple Watch, and the Live Activity / Dynamic Island during active sun sessions. FREE FEATURES • Real-time UV index for your location • Manual supplement logging in IU • Daily progress ring with goal • Small home-screen widget • Apple Watch progress ring + supplement logging • Apple Health integration (read & write Vitamin D) PRO (subscription or lifetime) • Active sunbathing timer with sunburn-prevention safety • Live Activity & Dynamic Island for live sessions • Passive background tracking (no timer required) • Smart sun-window alerts using forecast UV • Lock-Screen widgets and the medium home-screen widget • Apple Watch UV insights and advanced complications • Weekly & monthly trends with Apple Health comparison • CSV history export for your healthcare provider • On-device skin type analyzer (camera + Vision) • Removal of all advertising PRIVACY Your skin profile, location, and Health data stay on your device or in your private iCloud. We never sell or share personal data. Ads (free tier only) use Apple's privacy-preserving SKAdNetwork. DISCLAIMER D3-Sync provides estimates and is not medical advice. Always consult a qualified healthcare professional before changing supplementation, sun exposure, or treatment. Terms of Use (EULA): https://bigkrzyh.github.io/D3-Sync/terms.html Privacy Policy: https://bigkrzyh.github.io/D3-Sync/privacy.html