Sun-Day

Sun Day — Smart Sun Exposure & Vitamin D Tracking

Sun Day helps you get the right amount of sun for healthy vitamin D without overexposure.

🌞 Personalized Sun Sessions

Enter your skin type, age, and clothing, and Sun Day recommends when and how long to be in the sun in your location. Real-time UV data lets you start a session and track how much vitamin D you synthesize.

⏱️ Burn Timer

The burn timer estimates when you may start to burn based on your profile. Get alerts before you overexpose and protect your skin.

📊 Your Sun Data

View history of sun sessions, vitamin D trends, and progress over time. See forecasts and plan around the best UV windows.

❤️ Health Integration

Sun Day can sync vitamin D synthesis with Apple Health (iOS) so you see your sun exposure in your health data.

🏆 Stay Motivated

Daily challenges, achievements, and streaks make sun exposure a simple, engaging habit.

Features

Real-time UV index from your location

Personalized burn time and vitamin D estimates

Forecast and best-time recommendations

Session history and export

Dark mode

Daily challenges and achievements

Your safety first

Sun Day uses guidelines from health authorities for vitamin D and UV exposure. It does not replace medical advice. Always follow your doctor’s recommendations and use sunscreen when needed.

Download Sun Day and build a healthier sun routine.