SunDose vs RayDay

Don’t fear the sun — master it. SunDose is your personal sun coach: an AI-powered health assistant that blends your skin type, location, and goals with real-time UV data so you get the right amount of sun — for vitamin D, mood, or a healthy tan — without burning or accelerating skin aging. WHAT MAKES SUNDOSE DIFFERENT • Real-time UV tracking — Live UV index, solar angle, and ozone data for your exact location. No guesswork. • Science, not guesswork — We use the WHO Standard Erythema Dose (SED) model, the same metric used in clinical UV research. Our methodology is patented and backed by dermatology expertise. • 6 personalized modes — Vitamin D Boost, Natural Tanning, Skin Protection, Enhanced Mood, Skin Rejuvenation, and Outdoor Activity. Each mode gives you a step-by-step routine tailored to your goal. • Smart session timer — A countdown that adapts as conditions change: clouds, added sunscreen, or different exposure areas. Alerts you before you approach burn risk. • Your skin, in the equation — Fitzpatrick skin type (I–VI), SPF, clothing, and body surface area all factor into your safe exposure window. Track daily, weekly, and monthly UV load on a clear calendar view. • One app for the whole family — Create profiles for yourself, your partner, and your kids. Each profile has its own skin type, goals, and history. • Sunscreen recommendations — Find and compare products that match your skin type, age, and environment. SunDose suggests the right product at the right time. • Live tracking & alerts — Color-coded skin load indicators and audible alerts so you stay within safe limits. Optional alarms keep you on track even when the app is in the background. Sun in moderation for maximum health. Download SunDose and start your first smart sun session today. Subscriptions SunDose offers auto-renewing subscriptions. Payment is charged to your Apple ID account at purchase. Subscription renews automatically unless canceled at least 24 hours before the end of the current period. Manage or cancel in your App Store account settings. Legal Privacy Policy: https://sundose.app/privacy Terms of Use (EULA): https://sundose.app/terms

I built RayDay after years of working indoors left me Vitamin D deficient. The fix wasn't another bottle of pills. It was knowing exactly when the sun was high enough so my body could make Vitamin D the way it always has: naturally, on its own. That's all RayDay does: it tells you your daily sun window, personalized to where you live and your skin type, so you can get Vitamin D the way your body was built to. FEATURES: • D-Window Calculator: know exactly when Vitamin D production is possible today and tomorrow • Live Solar Path: a beautiful animated arc showing the sun's position, sunrise, sunset, and the highlighted D-Window • 7-Day Forecast: see your D-Window for the coming week • Skin Type Personalization: your Fitzpatrick type determines how fast you make Vitamin D • Smart Notifications: get alerted before optimal sun days, plus a heads-up when winter's first D-Window returns • Atmospheric Data: real-time UV index, cloud cover, humidity, and altitude • Phase-Aware Design: app colors shift with the time of day. Dawn, daytime, sunset, and night • Home Screen Widget: a quick glance at your D-Window status • Works Worldwide: accurate for any latitude, including polar regions HOW IT WORKS: RayDay uses NOAA solar position algorithms to calculate the sun's altitude throughout the day. When the sun crosses 35° above the horizon, UVB rays penetrate the atmosphere. That's your D-Window for Vitamin D synthesis. The app factors in your Fitzpatrick skin type to recommend exposure durations that hit your daily IU goal without overexposure. Some features require a paid subscription. DISCLAIMER: RayDay is for educational purposes only. Consult a healthcare professional before changing Vitamin D supplementation or sun exposure habits. --- LEGAL: Privacy Policy: http://www.jakubl.com/privacy.html Terms of Use (EULA): http://www.jakubl.com/terms.html SUPPORT: support@jakubl.com X: @jakublaszczyk