Vitamin D Tracker - Sun & IU

Vitamin D Logger is a calm, private way to track how much Vitamin D you actually get each day — from supplements, sunlight, or both. Log a capsule in two taps. Log a sun session with your skin type and minutes outdoors, and the app gives you a conservative IU estimate based on the live UV index near you. Bring a one-page PDF to your next doctor visit and have a real conversation about your D levels.

KEY FEATURES:
• Two-tap supplement entry — pick a quick-pick dose (400, 1000, 2000, 5000, 10000 IU and more) or type your own. Brand autocomplete remembers what you usually take.
• Sun-session estimator — enter your Fitzpatrick skin type, how much skin was exposed, and how long you stayed outside. The app reads the current UV index near you and converts it to a conservative IU estimate.
• Daily IU dashboard — today's total, broken down by supplement vs sun, with a rolling 7-day list of recent entries.
• Trends and insights — daily IU trend chart, 30-day total, average daily IU, most- used supplement brand, and split between sun and supplement sources.
• Doctor-ready PDF report — one-page summary with period, total IU, daily average, source split, and top brands. Share with your GP in seconds.
• CSV export — full data export for spreadsheets, research, or your own records.
• Daily reminder — gentle evening nudge so you do not forget to log. Pick the time yourself and turn it off any time.
• Truly private — no account, no sign-in, no cloud. All your data stays on your
device unless you choose to share an export.
• Free + one-time Premium — buy once, own forever. No subscription.
• Six languages — English, Spanish, French, Portuguese, Hindi, Urdu, Arabic.

WHY CHOOSE VITAMIN D LOGGER?
• Honest about what we are. Vitamin D Logger is a logging tool, not a medical device. Every sun-derived IU is clearly labelled as an estimate. We are not a substitute for a serum 25(OH)D blood test or your doctor.
• Designed for the real world. Track supplements, sun, or both. Use it in the dark Nordic winter when sun is scarce, in South Asia where deficiency is widespread, or anywhere in between.
• Built around a single conservative formula. The sun-IU estimate caps each session at the minimal erythemal dose, so the app will never reward sunburn risk.
• No paywalled basics. Daily logging, history, dashboard, and reminders are free forever. Premium unlocks unlimited history, detailed insights, doctor PDF exports, and removes ads.
• Works offline. No internet needed except when you tap "Fetch UV near me".

PERFECT FOR:
• People taking Vitamin D supplements who want a clear daily and weekly view.
• Anyone trying to balance sun exposure with supplement intake.
• Patients tracking response to a Vitamin D protocol prescribed by their doctor.
• People in northern latitudes during winter, when natural Vitamin D synthesis
drops sharply.
• Anyone preparing for a clinic visit who wants a clean, one-page summary.

A FEW NOTES:
Vitamin D Logger does not diagnose, treat, cure, or prevent any condition. If you suspect Vitamin D deficiency, talk to a qualified healthcare professional and ask for a 25(OH)D blood test. The app's sun-IU numbers are rough behavioural estimates based on UV index, skin type, exposure, and time — they are not clinical measurements.

Download Vitamin D Logger and start your daily IU log today. Your future self,
and your doctor, will thank you.