# SunDay: Vitamin D & UV Tracker — Skin health and protection > Vitamin D tracker and sun safety assistant with UV scanning and supplement calculation. (iPhone/iPad app by Heuristic Innovations.) - Source: https://appshunter.io/ios/app/sunday-vitamin-d-and-uv-tracker/id1133953409 (this page in markdown: same URL + `.md`) - Developer: [Heuristic Innovations](https://appshunter.io/developer/1133953408) - Category: Health & Fitness, Lifestyle - Price: Free - Rating: 3.90/5 from 33 App Store ratings · 21 written reviews indexed - Age rating: 4+ - Requires: iOS 16.0 · 165 MB - Languages: American English, French (France), Russian, European Spanish - Released: 2017-07-22 - Data updated: 2026-06-02 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/sunday-vitamin-d-and-uv-tracker/id1133953409/reviews.md ## What is SunDay? Vitamin D made easy. Monitor your daily intake with our all-in-one Vitamin D solution. Track your vitamin D intake, measure progress, and create healthy habits. SunDay helps you make sure that you are safe while being out in the Sun. With our smart Timer you can relax while enjoying your time outside, as we will notify about sunburn risks. Don’t want to do it manually? Get your own trendy SunDay necklace and have the calculations done automatically no matter where and when! Taking some additional Vitamin D supplements for better health? Include them in your account and receive the most detailed information about your Vitamin D level. How it works ‣ Scan the Sun ‣ Start the timer ‣ Know when to end the session ‣ Complete daily vitamin D goal ‣ Track progress ‣ Build healthy habits Features • Solar UV Scanner • Sun Finder - for cloudy weather • Session Timer and Calculator • Vitamin D Supplements Calculator • Vitamin D Supplements reminders • Daily goals and reminders • Profile customization • Progress stats and achievements • Necklace integration The calculations are done with utmost precision based on your skin type, age, weight and clothing. In addition to helping prevent skin damage, SunDay will display how much vitamin D IU you receive during the time in direct sunlight. Our goals - Spread the word about the benefits of Sun-generated vitamin D - Prevent vitamin D deficiency among children and adults - Create more reasons for families to spend time outdoors - Healthier lifestyles Disclaimer SunDay is intended to be used for educational purposes only. It should not be used as a substitute for professional medical advice. Please consult your health care professional before making any health, medical or other decisions based on the results of the daily calculations of vitamin D intake provided by this app. ## Key features - Vitamin D intake tracking - Sunburn risk timer - Supplement calculator - UV scanner - Progress statistics - Necklace integration ## Recent user reviews (10 of 21) All indexed reviews: https://appshunter.io/ios/app/sunday-vitamin-d-and-uv-tracker/id1133953409/reviews.md ### 1/5 — Камера на планшете не работает должным образом *2025-07-18, version 3.2.3* Видимо нет поддержки Ipad, так как при настройке приложения камера боком и как я не крутила бы планшет, то никак ровно не ставится она и съемка меняется с поворотом и солнце не поймать, даже в повернутом виде ничего не происходит. ### 1/5 — gimmicky *2025-07-15, version 3.2.3* i did an experiment and pointed it to a bright flashlight from my ipad ..and apparently my flashlight from my ipad has a UV index of 1 …make it make sense 🫠🫡.. and you want us to take this app’s recommendations for my skin health. ? ### 5/5 — Such a Fantastic app. *2025-07-14, version 3.2.3* Really Timely also, execution is well laid out, pretty easy. ### 5/5 — Absolutely LOVE this app! *2025-03-19, version 3.2.2* I don’t usually leave reviews, but this app deserves it. From the moment I downloaded it, I was blown away by how easy it is to use and how smoothly it works. Everything is designed perfectly no annoying ads, no glitches, just pure convenience. The best part? It saves me SO much time and makes my day way easier. Every feature feels like it was made just for me. And it’s not just me even my mom uses this app all the time! She’s always telling me how much it helps her stay organized and how simple it is to use. If both me and my mom love it, you KNOW it’s something special. Trust me, once you try it, you’ll wonder how you ever lived without it. I’ve already recommended it to all my friends, and they’re hooked too. Don’t wait download it now and thank me later! ### 5/5 — LOVE IT ! *2025-03-19, version 3.2.2* This app made my life so much easier ! Also downloaded for my kids too, it’s very easy to use ### 5/5 — The best app *2025-03-19, version 3.2.2* 👍 ### 3/5 — Only works half the time *2025-03-02, version 3.2.2* I love this app when it’s working, but at least half the time I try to use it, after I do the sun snapshot, it goes to a blank screen and won’t load. Very annoying. ### 1/5 — Pretty app, can’t start without “scanning”, obsolete gender concepts *2024-07-23, version 3.2.2* Look I don’t have time to aim my phone at the sun to start this. The app is pretty, but I just want a ballpark based off the UV index. Starting this is just too hard. And just two genders? How quaint. You’re forced to pick the “girl” or “boy” avatar with stereotypical clothing and hair. Gross. ### 2/5 — Only worked once *2023-09-10, version 3.2.2* I really wish this app worked. I got it to work once and the information was very helpful. Unfortunately, I just get a blank screen after taking a picture of the sun. I have reset the app and redownload without success. ### 4/5 — If only it had Apple Health support *2023-06-07, version 3.2.2* This app would literally be perfect if it automatically linked to Apple health and uploaded your vitamin D intake. I would get the SunDay necklace for sure if everything just worked together seamlessly; the necklace tracks my vitamin D intake, the app logs it, and my Apple health stores the results for me to view all my nutritional and medical information in one place. Other than that I love the UI interface and easy use of the app. ## Frequently asked questions about SunDay ### How does SunDay calculate Vitamin D intake? SunDay calculates Vitamin D intake based on your skin type, age, weight, and clothing. It uses this data along with solar UV scanning and session timing to provide precise estimations. ### Can SunDay help prevent sunburn? Yes, SunDay features a smart timer that notifies you about sunburn risks. This helps you know when to end your sun exposure session to protect your skin. ### Does SunDay track Vitamin D supplements? Absolutely. You can include any additional Vitamin D supplements you take in your account. The app then provides detailed information about your overall Vitamin D level. ### What is the Sun Finder feature in SunDay? The Sun Finder feature is designed to help you locate optimal sun exposure even on cloudy weather days. It assists in maximizing your Vitamin D generation. ### Is SunDay available on all devices? Currently, SunDay is supported on iPhone devices. The app is intended for educational purposes and should not replace professional medical advice. ### How often is SunDay updated? The latest version of SunDay is 3.2.3, last updated on May 27, 2025. Updates typically focus on improving calculations, adding features, and enhancing user experience. ### What is the user rating for SunDay? SunDay has a rating of 3.9 stars based on 33 ratings. This indicates a generally positive user reception, though there is room for improvement. ### Does SunDay offer a paid version or subscription? No, SunDay is available for free and does not have in-app purchases or ads. The app aims to make Vitamin D monitoring accessible to everyone. ## Version history (last 5 releases) ### 3.2.3 — 2025-05-27 We’ve made performance improvements and squashed some bugs to make tracking your Vitamin D even smoother. Enjoy a better, faster experience! ### 3.2.2 — 2021-08-01 We have exciting updates! This update includes the following changes and improvements: - Ability to easily edit your profile; - Performance improvements; - Bug fixes. As always, don't forget to share your feedback with us by rating SunDay on the App Store or contacting us directly at feedback@sundayapp.co ### 3.2.1 — 2021-01-09 We have exciting updates! This update includes the following changes and improvements: - Ability to learn more about your personal SunDay Necklace; - Ability to add your Vitamin D supplements to the calculations to make them more precise; - Bug fixes and performance improvements. As always, don't forget to share your feedback with us by rating SunDay on the App Store or contacting us directly at feedback@sundayapp.co ### 3.2.0 — 2020-09-11 We have exciting updates! This update includes the following changes and improvements: - Ability to learn more about, and add your personal SunDay Necklace; - Ability to add your Vitamin D supplements to the calculations to make them more precise; - A Reminder feature to always remember to take your Vitamin D supplements on time; - Bug fixes and performance improvements. As always, don't forget to share your feedback with us by rating SunDay on the App Store or contacting us directly at feedback@sundayapp.co ### 3.1.0 — 2019-09-12 We are constantly working on making SunDay better for you. This update includes the following changes and improvements: - Ability to manually scan the Sun for increased precision - Bug fixes and performance improvements - Localisations for French, Russian, and Spanish languages Don't forget to share your feedback with us by rating SunDay on the app store or contacting us directly at feedback@sundayapp.co ## Apps similar to SunDay | App | Rating | Price | Category | | --- | --- | --- | --- | | [Daylight Goals Sunlight Timer](https://appshunter.io/ios/app/daylight-goals-sunlight-timer/id6466341899) | 4.7 (82) | Free | Health & Fitness | | [Sun Exposure: Time in Daylight](https://appshunter.io/ios/app/sun-exposure-time-in-daylight/id6463570196) | 4.5 (40) | Free | Health & Fitness | | [Sun Day Tracker](https://appshunter.io/ios/app/sun-day-tracker/id6748545544) | 4.6 (17) | Free | Health & Fitness | | [Helys](https://appshunter.io/ios/app/helys/id6449147563) | — | Free | Health & Fitness | | [Vitamin D™ · UV Index](https://appshunter.io/ios/app/vitamin-d-uv-index/id6470038527) | 5.0 (1) | Free | Health & Fitness | | [SunSense UV tracker](https://appshunter.io/ios/app/sunsense-uv-tracker/id1228142293) | 5.0 (2) | Free | Health & Fitness | ## Related topics [heuristic innovations](https://appshunter.io/ios/topics/heuristic-innovations) · [sunday](https://appshunter.io/ios/topics/sunday) · [dminder](https://appshunter.io/ios/topics/dminder) --- *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 2026-06-02.*