Start tracking your Vitamin D today
Free on iOS and Android. Upgrade to Pro anytime.
dminder uses real-time satellite ozone data, forward-integrated erythemal dose calculations, and peer-reviewed algorithms. The science is never gated. Go Pro for the full picture of your vitamin D journey.
No degraded results. No approximate formulas. The free version uses the same satellite data and algorithms as Pro.
NOAA satellite data refreshed throughout the day. Not estimates.
Forward-integrates along the sun's trajectory. Morning sessions burn differently than afternoon.
Personalized burn time based on skin type, medications, UV index, and solar angle.
Continuously estimates your blood level from sun, supplements, and lab results.
Free tracks today. Pro reveals the full picture — every session, every supplement, every lab result, and a pharmacokinetic model that projects where you're headed.
Free users see the last 90 days. Pro unlocks your entire vitamin D timeline — every sun session, every supplement, every food dose, going back to the day you started.
Your data is never deleted. It's waiting for you.
123 more sessions
Unlock with Pro
See where your vitamin D level is headed. The projection engine uses pharmacokinetic modeling — the same math your doctor uses — to show you:
Your blood tests are expensive. Make them count. Pro plots every lab result on a timeline alongside your session data and supplement logs, so you can see what's actually working.
Free users see their last 3 lab results. Pro shows all of them — the full arc of your vitamin D journey.
When your lab result doesn't match the prediction, Pro helps you understand why — missed supplements, seasonal changes, weight fluctuations, or absorption issues.
Not a fitness tracker that nags you to go outside. A results report that shows you what you've built — your level, your reserve, your badges. The app celebrates your outcomes, not your inputs.
From the outside, this looks like a summer app. It's not. Summer is when you build your vitamin D reserve. Winter is when that reserve is under siege — UV drops to near zero, your level decays at ~2% per day, and most people quietly slip into deficiency without realizing it.
Build your reserve. Bank runway. Every session adds to your winter armor.
Monitor your buffer. Start supplements. The digest tells you how many days of protection you've banked.
Hold the line. Your weekly digest tracks whether supplements are keeping you above 30 ng/mL. This is the season that matters most.
Share with your doctor, import into a spreadsheet, or keep as a personal record.
Download your full history as CSV for spreadsheets or a formatted PDF report for your doctor. See seasonal patterns, year-over-year comparisons, and session insights.
Free tracks today. Pro reveals the whole journey.
$0
Forever
$9.99/yr
Less than $1/month
$24.99
One-time purchase
Cancel anytime. Subscriptions managed through the App Store or Google Play.
| Feature | Free | Pro |
|---|---|---|
| Vitamin D calculations | ||
| Real-time satellite ozone | ||
| Smart timer + burn safety | ||
| D level estimation | ||
| iCloud sync | ||
| Watch app + Live Activity | ||
| Session history | 90 days | All time |
| Supplement & food dose history | 90 days | All time |
| Lab results | Last 3 | All |
| D-Level Projection | Teaser | Full |
| Vitamin D Digests | Weekly + Monthly + Quarterly + Annual | |
| Ad-free | ||
| Cross-platform cloud sync | ||
| CSV & PDF export | ||
| Trend analysis & seasonal patterns |
If you purchased the original dminder app, we haven't forgotten you. The rewrite automatically detects your purchase and gives you unlimited history, ad-free experience, export, and analytics forever. iCloud sync is yours too.
Want cross-platform cloud sync between iOS and Android? We offer a 50% loyalty discount at $4.99/year as a thank you for supporting us all these years.
dminder calculates vitamin D production using real-time NOAA satellite ozone measurements, solar position algorithms, erythemal dose integration, and personalized burn models developed with Dr. Michael Holick. Nobody gets wrong numbers because they didn't pay. Safety is not a premium feature. Every user gets the same accurate calculations. Period.
Free on iOS and Android. Upgrade to Pro anytime.