# Sundog: Sun Exposure Tracker — Smart Sun Exposure, Every Day > Personalized daily sun exposure schedules for optimal health and wellness. (iPhone/iPad app by ALAN D NAVARRO LOPEZ.) - Source: https://appshunter.io/ios/app/sundog-sun-exposure-tracker/id6765758203 (this page in markdown: same URL + `.md`) - Developer: [ALAN D NAVARRO LOPEZ](https://appshunter.io/developer/1895892153) - Category: Health & Fitness, Weather - Price: Free - Rating: 5.00/5 from 3 App Store ratings · 1 written reviews indexed - Age rating: 12+ - Requires: iOS 15.1 · 29 MB - Languages: American English - Released: 2026-05-04 - Data updated: 2026-07-09 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/sundog-sun-exposure-tracker/id6765758203/reviews.md ## What is Sundog? Most people either avoid the sun entirely or stay out too long. Sundog helps you do neither. Built around four science-backed goals, Sundog gives you a personalized daily sun schedule — calibrated to your skin type, the live UV index, and real-time cloud cover. A smart timer tells you exactly how long to be outside, and your burn limit is always visible so you know when to head back in. Four Goals. One Routine. - Circadian Reset — Morning light sets your body clock for the day. A short session before 9am resets your sleep-wake rhythm, lifts mood, and sharpens focus. - Vitamin D — Midday UVB is your window. Sundog times your session to maximize D synthesis and stops automatically before you reach your burn limit. - Gradual Tan — Afternoon light has lower UV intensity. Sundog schedules your exposure when the risk is lowest and the result is real. - Sleep Optimization — Evening golden-hour light cues melatonin production, making it easier to fall asleep and stay asleep. Smart, Not Just Simple Sundog's timer isn't a countdown — it's a calibrated recommendation. It reads the live UV index and adjusts your session length automatically. Heavy cloud cover? Session extended. UV extreme? Pulled back. Your burn limit is always front and center. Built Around Your Skin Set your Fitzpatrick skin type once. Sundog uses it to calculate your personal burn limit at any UV level and adjust every session recommendation accordingly. Skin type I gets very different guidance from skin type V. Time-Window Gating Each goal has a scientifically appropriate time window. Circadian Reset is a morning-only session. Vitamin D is gated to the midday UVB window. Sleep Optimization surfaces in the evening. You always know whether your window is open, closing soon, or already passed for the day. Sun Tracker A visual emoji-based tracker shows your progress across the day — which sessions you've completed, which are still open, and what's coming up next. Daily Sun Insights Every day, Sundog surfaces a new insight — practical, evidence-based tips on UV, circadian biology, and getting more from your time outside. Available in English and Spanish. Sundog is designed for general wellness purposes only. It is not a medical device and does not provide medical advice. Consult a qualified healthcare professional before changing your sun exposure habits, particularly if you have a skin condition, a history of skin cancer, or are taking photosensitizing medications. UV exposure carries inherent risks. Always use appropriate sun protection. ## Key features - Personalized daily sun schedule - Calibrated to skin type and UV index - Smart timer for exposure duration - Burn limit visibility - Four science-backed sun goals - Daily sun insights and tips - Progress tracker ## Recent user reviews (1 of 1) All indexed reviews: https://appshunter.io/ios/app/sundog-sun-exposure-tracker/id6765758203/reviews.md ### 5/5 — Game Changer 😎 *2026-05-05* This app is a game changer for someone like me who both lives in Florida and works outside a lot. I use it to help me keep track of my sun exposure and prevent myself from overexposure and farmers tans 😁🤙🏽 ## Frequently asked questions about Sundog ### What is Sundog? Sundog is a health and fitness app that provides personalized daily sun exposure schedules. It helps users optimize their time in the sun for benefits like vitamin D synthesis and circadian rhythm regulation, while also warning them about their burn limit. ### How does Sundog personalize my sun schedule? Sundog calibrates your daily sun schedule based on your Fitzpatrick skin type, the live UV index, and real-time cloud cover. This ensures recommendations are tailored to your individual needs and environmental conditions. ### What are the four science-backed goals of Sundog? The four goals are Circadian Reset (morning light for sleep-wake rhythm), Vitamin D synthesis (midday UVB exposure), Gradual Tan (afternoon light for tanning), and Sleep Optimization (evening golden-hour light for melatonin production). ### Does Sundog provide medical advice? No, Sundog is designed for general wellness purposes only and is not a medical device. It does not provide medical advice. Users should consult a healthcare professional for any health concerns. ### What devices is Sundog available on? Sundog is available on iPhone, iPad, and iPod. It is designed for iOS devices. ### How often is Sundog updated? Sundog was last updated on May 4, 2026, with version 1.0. Future updates will likely continue to refine its features and accuracy. ### Is Sundog free to use? Yes, Sundog is completely free to download and use. There are no in-app purchases or advertisements. ### What is the age rating for Sundog? Sundog has an age rating of 12+. This indicates it is suitable for users aged 12 and older. ## Version history (last 1 release) ### 1.0 — 2026-05-04 No release notes. ## More apps by ALAN D NAVARRO LOPEZ - [DayBlocks - Countdown Widget](https://appshunter.io/ios/app/dayblocks-countdown-widget/id6767698938) All apps by ALAN D NAVARRO LOPEZ: https://appshunter.io/developer/1895892153 ## Related topics [exposure tracker](https://appshunter.io/ios/topics/exposure-tracker) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-09.*