Track your vitamin D and sun exposure with intelligent UV monitoring
Personalized sun exposure guidance for optimal health, safely.
Bask Ring
3,600 IU
72% of 5,000 IU goal
Active Session
12:34
+842 IU · UV 6.2
Next D-Window
Tomorrow 11:00 AM - 1:00 PM
Optimal 2-hour window · UV 7-8
UV Index: 6.2
Moderate
Vitamin D: 72%
On track today
Everything you need to optimize your sun exposure
Real-Time UV Monitoring
Get live UV index data for your exact location, updated every 5 minutes. See your city, current conditions, and know the perfect moment to step outside.
Personalized D-Engine™
Our proprietary algorithm calculates vitamin D synthesis based on your skin type, age, clothing, and current UV conditions.
Smart Sun Sessions
Start a timed session and watch your vitamin D accumulate in real-time. See your IU count, sunburn risk, and clothing coverage—all in one elegant interface.
48-Hour D-Window Forecast™
Get intelligent predictions for the best sun exposure windows over the next 2 days. Bask analyzes hourly UV forecasts and cloud cover to recommend optimal 1-3 hour windows.
Apple Health Integration
Read "Time in Daylight" to estimate passive vitamin D and write your vitamin D supplement intake so other health apps can see your complete nutritional data.
How Bask Works
Personalize Your Profile
Select your skin tone, sun reaction, age, weight, and goals. Bask calculates your Fitzpatrick skin type and creates a personalized vitamin D synthesis model.
Get Real-Time Guidance
Our D-Engine analyzes current UV index, cloud cover, and your profile to recommend safe sun session durations. Watch your vitamin D accumulate in real-time (IU per minute).
Track & Optimize
Log sun sessions, supplements, and cofactors (K2, magnesium). See your Bask Ring progress, streaks, and trends.
Frequently Asked Questions
Get Your Personalized Solar Plan
Download Bask — Free on iOS. Start tracking your vitamin D and optimizing your sun exposure today.
Get in Touch
Have questions? We'd love to hear from you.