SolGlow: Vitamin D Tracker
Michael Smith Health & Fitness iPhoneiPadiPod touchApple Watch
SolGlow: Vitamin D Tracker is a free Health & Fitness app for iPhone and iPad by Michael Smith. Rated 3.7/5 from 3 ratings. Requires iOS 17.2.
- Rating
- 3.7
- 3 ratings
- Price
- Free
- on the App Store
- Size
- 9 MB
- Age 12+
- Updated
- Sep 5
- 2026 · v1.9
Screenshots
About SolGlow: Vitamin D Tracker
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 only network call fetches a UV forecast (coordinates only, no identifier). Optional backup goes to your own iCloud, never to us. FREE TO TRY — THEN PICK YOUR PLAN Every feature free for 14 days. Then choose your SolGlow Pro: $9.99 per year, auto-renewing until you cancel — or $19.99 once, yours forever with Family Sharing included. The free tier keeps today's tracking and all safety alerts, always. SolGlow estimates are educational, not medical advice. Always consult your clinician about vitamin D supplementation and blood testing. SolGlow Pro Annual is an auto-renewing subscription: $9.99 per year, charged to your Apple ID at purchase confirmation. It renews unless cancelled at least 24 hours before the period ends. Manage or cancel in your App Store settings. SolGlow Pro Lifetime is a one-time purchase that never renews. Privacy Policy: https://twisteddatastudios.com/privacy.html Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
What’s new
Version 1.9 · Updated September 5, 2026
Direct Sun: for the days you're not just outside — you're out in it. DIRECT SUN (PRO) Start a session in Direct Sun mode and the headline number becomes your burn budget: the share of today's burn threshold you've spent, live on your Lock Screen and Dynamic Island. It never recommends more time and never estimates a tan — it only counts down, and tells you plainly when it's time to get out. Sunscreen (with the reapply timer) stretches the budget; nothing else does. YOUR BURN ALERTS GOT MORE HONEST (FREE, FOR EVERYONE) A sharp-eyed user in New Zealand — with a weather station on an all-day-sun deck — showed us a wrong cloud forecast could talk the app into "no burn risk" on a burning day. Fixed, at the physics level: burn math now refuses to believe clouds remove more than half of the clear-sky UV at your sun angle. Forecasts can be wrong; your burn alerts no longer inherit their optimism. ALSO NEW • Sky looks clear? Tell SolGlow, and for the next 30 or 60 minutes it uses true clear-sky UV instead of a cloudy forecast — labeled, with a countdown • Add your own vitamin-D foods (green-lipped mussels, anyone?) — and serving sizes now speak metric where you do • Raising your daily goal no longer erases history: past days keep the goal they were lived under, so met days stay met • Sun sessions now have an in-app status page, and past sessions can be reviewed and edited in History • "September Head-Start" is now Winter Head-Start — it always keyed off your latitude's seasons, and now its name works in both hemispheres • The serum projection now states its assumption: your current intake, held steady As always: no accounts, no analytics, no ads. Your data stays on your device (and your own iCloud only if you enable backup). Estimates are educational, not a diagnosis — always consult your clinician about vitamin D and blood testing.
App privacy
The developer, Michael Smith, reported these privacy practices to Apple.
Data Not Linked to You
The following data, which may be collected but is not linked to your identity, may be used for the following purposes:
- Location: Precise Location
Used for: App Functionality
Alternatives to SolGlow: Vitamin D Tracker
Looking for apps like SolGlow: Vitamin D Tracker? Here are 6 similar apps on the App Store. The highest rated is Vitamin D Window Widget (5.0/5), and 5 of the 6 are free to download.
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D3-Sync: Sun & Supplements
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Vitamin D Window Widget
5.0
-
Sunshine — Vitamin D Tracker
5.0
-
Correlate: Life Journal
-
CALMA : Cortisol Journal
-
INTERMISSIO
5.0
| App | Rating | Price | Last updated |
|---|---|---|---|
| SolGlow: Vitamin D Tracker | 3.7 / 5 (3 ratings) | Free | September 5, 2026 |
| D3-Sync: Sun & Supplements | – | Free | Jun 1, 2026 |
| Vitamin D Window Widget | 5.0 / 5 (2) | Free | Aug 12, 2026 |
| Sunshine — Vitamin D Tracker | 5.0 / 5 (7) | Free | Sep 5, 2026 |
| Correlate: Life Journal | – | 12.99 USD | May 21, 2026 |
| CALMA : Cortisol Journal | – | Free | Jun 20, 2026 |
| INTERMISSIO | 5.0 / 5 (1) | Free | Apr 27, 2026 |