The best time to get vitamin D from the sun isn't early morning or late afternoon — it's midday, when the sun is high enough for UVB rays to reach your skin. Learn exactly when your body can produce vitamin D based on your location and season.
Learn how much vitamin D your body produces from sunlight, what factors affect UVB absorption, and how to calculate your optimal sun exposure time based on skin type, location, and season.
RayDay uses NOAA solar algorithms to calculate your daily vitamin D window, track IU production in real-time, and keep you safe with a burn countdown timer. Free on iPhone.
Learn the signs of vitamin D deficiency, why over 1 billion people don't get enough, and how to optimize your sun exposure to produce vitamin D naturally — safely and efficiently.
Nova Fast is a new intermittent fasting tracker that goes beyond simple timers. Track 7 biological phases in real-time, from fat burning to autophagy and cellular repair — with widgets, water tracking, a journal, and XP gamification.
The biggest Plates update yet. Track sets from your wrist with Apple Watch, earn XP with daily challenges, get AI weekly reviews, see muscle volume charts, and switch between barbell and dumbbell modes.
Progressive overload is how you get stronger. Learn what it is, how to track it, and when to increase weight — plus how apps like Plates can automate the process.