Sola: Vitamin D Tracker

Your skin is unique. Your sun exposure should be too.

Sola personalizes sun exposure recommendations based on your actual skin type. Sola is built for everyone.

HOW IT WORKS

1. Onboarding — You answer a few questions so that the app can learn you. In this way, it can recommend how much time you need in the sun and if you need to supplement.
2. Get your daily session — a personalized time recommendation based on your skin type, real-time UV index, and local weather
3. Track and improve — monitor your vitamin D journey with daily scores, weekly trends, and monthly reports

KEY FEATURES

- Personalized sun session timer based on your skin type and current UV conditions
- D Reserve — your vitamin D battery, modeling how much banked sun is still working for you
- Winter Banking Plan — see how many good sun days are left before winter at your latitude
- Morning Light — a one-tap circadian habit with its own streak, no UV needed
- Real-time UV index and weather data for your location
- 7-day UV and weather forecast so you can plan ahead
- Best sun windows — know the smartest times to step outside today
- Supplement logging — track vitamin D3, K2 and magnesium alongside sun exposure
- Lab result tracking — log your blood test results and see your levels over time
- Monthly symptom check-in — track fatigue, mood, energy, and sleep quality
- Analytics dashboard — daily scores, weekly trends, deficiency risk assessment
- Ask Sola AI — your personal vitamin D assistant, backed by peer-reviewed research with citations in the app
- Smart notifications — morning briefings with daily vitamin D facts, peak UV alerts, supplement reminders
- Share your journey — branded cards you can share with friends
- Dark mode — beautiful in any lighting
- Works offline — your data is always accessible

THE SCIENCE BEHIND SOLA

Sola's recommendations are grounded in dermatological research:
- Session times based on the Fitzpatrick scale and Minimal Erythemal Dose (MED) research
- UV data from Open-Meteo
- Safe exposure limits — never exceeds 45 minutes, never recommends burning
- Seasonal awareness — adjusts for winter, summer, latitude, and hemisphere
- Cofactor guidance — always reminds you about K2 and magnesium

WHY SOLA?

Vitamin D deficiency is common globally, with higher prevalence among people with darker skin tones. Darker skin can need 3-5x more sun exposure than lighter skin to produce the same amount of vitamin D — most apps ignore this. Sola doesn't.

SUBSCRIPTION

Sola Premium unlocks all features. $9.99/month or $49.99/year with a 7-day free trial on the yearly plan. Subscription auto-renews unless canceled 24 hours before the end of the current period. Manage or cancel anytime in your Google Play account.

Sola is a wellness tool, not a medical device. Always consult your healthcare provider for medical advice.