Vitamin D

Core Problem Many people, especially those with vitamin D deficiency, forget to get sunlight during the day. Sunlight is critical for vitamin D synthesis, which supports bone health, immunity, and mood. Missing daily exposure (especially in winter or for office workers) can worsen deficiencies. How It Works GPS-Based Sunset Alerts The app uses your location to calculate local sunset time. Sends a notification (e.g., “Sun sets in 1 hour! Time to get 15 mins of sunlight.”) Customizable Reminders Let users set a daily “sunlight goal” (e.g., 10–30 minutes). Adjust reminder timing (e.g., 1 hour before sunset or at lunchtime). Progress Tracking Log sunlight exposure manually or via weather API (e.g., “It’s sunny today—did you go outside?”) Weekly summaries showing progress toward vitamin D goals. ...