# TheCircadianBros App — Track Sun, Vitamin D & Sleep > Personalized sun exposure and vitamin D tracking app with daily plans. (iPhone/iPad app by The Circadian Bros, LLC.) - Source: https://appshunter.io/ios/app/thecircadianbros-app/id6789722310 (this page in markdown: same URL + `.md`) - Developer: [The Circadian Bros, LLC](https://appshunter.io/developer/6776371538) - Category: Health & Fitness, Lifestyle - Price: Free with in-app purchases - Rating: 5.00/5 from 8 App Store ratings · 2 written reviews indexed - Age rating: 4+ - Requires: iOS 15.1 · 68 MB - Languages: English - Released: 2026-10-23 - Data updated: 2026-10-31 - Monetization: freemium - User reviews in markdown: https://appshunter.io/ios/app/thecircadianbros-app/id6789722310/reviews.md ## What is TheCircadianBros App? Most people either avoid the sun entirely or get it by accident. TheCircadianBros App gives you a third option: a plan. Every morning it builds a schedule around three things: the UV forecast where you are, your skin type, and how much time you actually have outside. You get session times, how long to stay, and whether that time should be direct sun or shade. WHAT YOU GET • A daily plan, rebuilt each morning around the real forecast, not a generic reminder • Live sessions with a running timer, current UV, and cloud cover • Estimated vitamin D as it accumulates, adjusted for your skin type and how much skin is exposed • A full spectral breakdown of the light right now: UV-B, UV-A, blue, green, red, infrared • Your sleep next to the day that came before it, pulled from Apple Health • Streaks, with freezes for the days life gets in the way • Log sessions you did without the app, after the fact HOW IT WORKS Set your skin type once during setup, along with your wake time and how much time you can realistically spend outside. From there the app reads the UV forecast for your location and places your sessions where they do the most, within the session lengths your skin type calls for. Vitamin D windows land when UV is actually high enough to matter. Morning and evening sessions are placed for daylight, not vitamin D. On low-UV days the plan doesn't pretend otherwise, it stays honest and accepts a shorter day. PREMIUM Free includes your daily plan, live tracking, vitamin D estimates, and streaks. Premium adds unlimited live sessions, the live spectral breakdown, sleep and sunlight graphs, 30-day vitamin D trends, custom weekday routines, rescheduling, an extra streak freeze, live UV and cloud adjustments during a session, forecasts, and the full reading library. ABOUT THE NUMBERS Vitamin D figures in this app are estimates, modeled from UV data, your skin type, exposure, and time. They are not a measurement of vitamin D in your blood, and the app is not a substitute for medical advice. Session lengths are based on your skin type and current conditions, but no app can predict how your skin will respond, use your own judgment. SUBSCRIPTION TheCircadianBros App Premium is available monthly or yearly. Payment is charged to your Apple ID at confirmation of purchase. Subscriptions renew automatically unless canceled at least 24 hours before the end of the current period. Manage or cancel anytime in your Apple account settings. Terms of Use: https://thecircadianbros.com/policies/terms-of-service Privacy Policy: https://thecircadianbros.com/policies/privacy-policy ## Key features - Personalized daily outdoor schedule - UV forecast integration - Vitamin D estimation - Live session tracking with timer - Sleep data integration - Streak tracking ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | Premium Monthly | $4.99 | per month | | Premium Yearly | $39.99 | per year | ## Is TheCircadianBros App safe? Not enough ratings yet to assess TheCircadianBros App. ## Is TheCircadianBros App legit? TheCircadianBros App has limited verification signals. The AppsHunter Legitimacy Score for TheCircadianBros App is 58 out of 100 points across 7 verification signals from App Store and developer data. ## Recent user reviews (2 of 2) All indexed reviews: https://appshunter.io/ios/app/thecircadianbros-app/id6789722310/reviews.md ### 5/5 — Go Get Some Sun *2026-10-23* An amazing app! The interface is intuitive, and I love how it recommends exposure time based on my skin’s sensitivity to the sun. It also updates my planned time in the sun based on my location, the time of day, the weather, and my skin, making everything feel tailored to me. It’s helping me plan healthier sun exposure throughout the day to boost my vitamin D, and to improve my sleep and overall health. This will be a great tool to use at home or when traveling for work. Highly recommend! ### 5/5 — Great app *2026-10-23* The app is well designed and ensures the user is getting safe sun exposure. The reminders are great for someone with a busy schedule who forgets to take breaks outside. And there are a lot of neat features like the research, lux, and wavelengths chart when you tap on the sun. ## Frequently asked questions about TheCircadianBros App ### What is TheCircadianBros App? TheCircadianBros App creates a personalized outdoor schedule based on UV forecasts, your skin type, and available time. It provides recommended session durations, whether to seek direct sun or shade, and estimates vitamin D accumulation. ### What features are included in the free version of TheCircadianBros App? The free version includes your daily plan, live tracking with a running timer, vitamin D estimates, and streak tracking. Premium features are available through subscription. ### How does TheCircadianBros App estimate Vitamin D? Vitamin D figures are estimates modeled from UV data, your skin type, exposure, and time. They are not a measurement of vitamin D in your blood and the app is not a substitute for medical advice. ### Can TheCircadianBros App track sleep? Yes, TheCircadianBros App pulls your sleep data from Apple Health to display alongside your daily sunlight exposure, allowing for a comprehensive view of your day and night. ### What are the subscription options for TheCircadianBros App Premium? TheCircadianBros App Premium is available with monthly and yearly subscription plans. The monthly plan costs $4.99 and the yearly plan is $39.99. ### How do I cancel my subscription to TheCircadianBros App Premium? You can manage or cancel your subscription anytime in your Apple account settings. Subscriptions renew automatically unless canceled at least 24 hours before the end of the current period. ### What devices is TheCircadianBros App available on? TheCircadianBros App is supported on iPhone and iPod devices. It is rated for ages 4 and up. ### How often is TheCircadianBros App updated? The app was last updated on October 29, 2026, with version 1.01. This indicates a recent update, suggesting ongoing development and support. ## Version history (last 2 releases) ### 1.01 — 2026-10-29 Meet the new TheCircadianBros App, with a fresh look and a calmer, smarter way to get your daily light. NEW - Your Rank: see how your sunlight habits add up (consistency, morning light, sleep, sun safety and more) and compare with friends. - The Moon: after sunset the moon rises on your Home screen with its real phase. Premium members can tap it for tonight's moon reading. - Time you didn't log (Premium): with Apple Health, your end-of-day review finds walks and outdoor time you forgot to track. Confirm what looks right and it counts toward your day. - Sessions no longer end on their own. Stayed out longer? Tell us and the extra time counts. - Winter-friendly vitamin D: on low-UV days you'll see a realistic target for today, so you can still hit what's possible. - Low UV counts too: direct sun at UV 1–2 now earns a little vitamin D. - New share cards, including one for your sleep. IMPROVED - A redesigned Friends page: add friends from one simple button, see when cheers arrived, and get a dot when there's something new. - Home fits smaller phones and larger text sizes. - Clearer Apple Health settings in your Profile. - Better guidance for building your own plan. - A new app icon. FIXED - Rate the App and Friends no longer close the app. - Many smaller fixes and polish. Thank you for getting outside with us. If you enjoy the app, a rating means a lot. ### 1.0 — 2026-10-23 No release notes. --- *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 2026-10-31.*