SolGlow: Vitamin D Tracker
iOS app by Michael Smith. Health & Fitness · Michael Smith
- Store rating
- 3 / 5
- Store rating count
- 2
- Download price
- Free to download
- In-app purchases
- Unknown
- Version
- 1.9
- Listing last refreshed
- 2026-09-08
View the original store listing
Store description excerpt
SolGlow turns your time outside into the number that matters: vitamin D — measured in IU, not just minutes. And it's automatic: your Apple Watch's daylight is credited to your estimate by itself — no logging, no GPS trail — and every number can show the exact math behind it. From your Time in Daylight, skin type, outfit, age, and your location's sun angle, SolGlow estimates the vitamin D you actually made today — and warns you before you burn. TODAY, AT A GLANCE • Live UV index and your personal IU-per-minute rate • One daily goal, tuned to your life stage • Burn-safe time remaining for your skin type, with alerts before you burn • Log vitamin-D foods — presets or your own, in your units • Morning Light: catch the first light that anchors your energy and sleep AUTOMATIC, AND YOU CAN SEE WHY (FREE) • True-D: SolGlow corrects the UV Index for ozone — because sunburn UV isn't vitamin-D UV — and shows the cited step whenever it changes your number (Kazantzidis 2009) • Vitamin D from your Apple Watch's Time in Daylight, credited automatically — no GPS trail, no manual logging, no tracking • Tap "See how this was calculated" and every number shows its math — the model, your real inputs, the studies on screen (Holick 2007, Spencer 1971) • Ask Siri "How much sun did I get in SolGlow?" — plus a Best Sun Window widget for StandBy, Lock Screen, and Home Screen OWN THE WINTER • Winter Mode: when your latitude's noon sun can't make vitamin D, SolGlow shows where yours is coming from — and counts down to the sun's return • Free Winter Countdown widget and Apple Watch complication — works offline • Streak Shield: only physics can excuse a missed day — winter freezes your streak instead of breaking it • One-tap supplement check-in from a notification, widget, Siri, or your watch BRING YOUR HISTORY (FREE) • Import your whole Time in Daylight history from Apple Health in one tap — no account • Back up everything to one file and restore on a new phone SUN SESSIONS (PRO) • Direct Sun: a live burn budget for deliberate sun time — it only counts down, and says plainly when to get out • Live Activity on your Lock Screen and Dynamic Island: live IU counter, burn-safe countdown • Sunscreen reapply timer with an "I reapplied" restart right from the notification • Editable history, streaks, goal rings, and a shareable weekly recap — plus the Apple Watch app PLAN AHEAD (PRO) • 7-day UV forecast with your personal best-sun windows • Annual sun plan: which months actually make vitamin D at your latitude • Trip Planner: destination UV plus a sleep-and-light schedule to beat jet lag (timing guidance, not medical advice) KNOW YOUR LEVEL (PRO) • 25(OH)D serum estimate with a 12-week projection • Cofactors: log magnesium, K2, B12, omega-3 • Personalized supplement guidance, blood-test reminders, and a doctor-ready PDF/CSV report PRIVATE BY DESIGN No account. No sign-up. No analytics. No ads. Your health data, profile, and location history never leave your device — the on
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