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"Master Your Sun Exposure" — Real-time UV tracking that keeps you safe and informed wherever you go.
Your personal guide to healthy sun time, perfectly balanced.
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.