---
title: "SunDay: Vitamin D & UV Tracker - Reviews, Revenue and Downloads in United States | Apple App Store"
description: "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"
---

# SunDay: Vitamin D & UV Tracker — United States
> Skin health and protection

![SunDay App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple221/v4/36/00/2e/36002e0e-45e5-3346-7581-63cb22b298be/AppIcon-0-0-1x_U007emarketing-0-11-0-85-220.png/400x400bb.png)

**Developer:** [Heuristic Innovations](https://apptail.io/developer/heuristic-innovations-JGpc)
**Category:** Health Fitness
**Rating:** 3.9/5 (33 ratings)
**Price:** Free
**Bundle ID:** com.Heuristic-Innovations.sunD
**Store:** Apple App Store
**Country:** United States
**Version:** 3.2.3 (released 2025-05-27)
**Original Release:** 2017-07-22

**App Store Link:** [Download on Apple App Store](https://apps.apple.com/us/app/app/id1133953409)
**AppTail Page:** [https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/united-states](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/united-states)

## SunDay Description
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.

## SunDay Screenshots
- [Screenshot 1](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource114/v4/6c/bd/08/6cbd0818-738c-eb14-e37c-5d499b82844c/7b09dc48-ab93-4d80-8746-84784e9482f4_02_-_Vitamin_D_Tracker@3x.png/1242x2688.png)
- [Screenshot 2](https://is1-ssl.mzstatic.com/image/thumb/Purple124/v4/19/75/f9/1975f9a1-251e-f53a-49c4-6793b9111d5e/pr_source.png/1242x2688.png)
- [Screenshot 3](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource114/v4/86/c6/a2/86c6a23b-2431-f489-6864-6b90d5a543e6/72dbf5aa-cd4b-4690-9bff-560df0830636_6.5_Know_How_Long__U0028english_U0029.png/1242x2688.png)
- [Screenshot 4](https://is1-ssl.mzstatic.com/image/thumb/Purple114/v4/ff/4b/ef/ff4befd0-b532-f655-ca82-b73bd0168f1d/pr_source.png/1242x2688.png)
- [Screenshot 5](https://is1-ssl.mzstatic.com/image/thumb/Purple114/v4/47/dd/ff/47ddff55-385b-699c-f1c5-6a207b1e12bf/pr_source.png/1242x2688.png)
- [Screenshot 6](https://is1-ssl.mzstatic.com/image/thumb/Purple124/v4/da/81/b4/da81b490-161b-3cbe-822e-198b92c35c15/pr_source.png/1242x2688.png)

## SunDay Rating Breakdown in United States
- 5 stars: 19 (58%)
- 4 stars: 4 (12%)
- 3 stars: 3 (9%)
- 2 stars: 1 (3%)
- 1 stars: 6 (18%)

## SunDay Reviews in United States

### ***** "Such a Fantastic app."
Really Timely also, execution is well laid out, pretty easy.
-- J. Mike Rosner, 2025-07-14

### ***** "Absolutely LOVE this app!"
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!
-- Kerikjj, 2025-03-19

### ***** "LOVE IT !"
This app made my life so much easier ! Also downloaded for my kids too, it’s very easy to use
-- naisnsis, 2025-03-19

### ***** "The best app"
👍
-- Roll)), 2025-03-19

### ***-- "Only works half the time"
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.
-- LEPuckett, 2025-03-02

### *---- "Pretty app, can’t start without “scanning”, obsolete gender concepts"
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.
-- jdn117, 2024-07-23

### ****- "If only it had Apple Health support"
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.
-- MonknMagic, 2023-06-07

### ***-- "Sessions not visible"
Every week or two I need to redownload the app because the upcoming sessions screen will not load. 
Decent app overall, just a bug that needs to be addressed
-- Ryanrn450, 2023-01-12

### ****- "Good app. Just wish I could correct exposure time when I forget to end the session."
As the title says: sometimes I just step out of the sun and forget to turn off the app. This makes the register very unreliable. It would be really useful if there was a way to correct those errors or at least delete them. Apart from that (and having tried all or most of them) I think this is the best app for the job, so congratulations to the devs.
-- nonhistoric, 2022-04-14

### ***** "Greatest of  getting  D"
I ve tried I think all of them in App Store !  But this is by far the best and easiest and believe the most accurate . You will not be disappointed in any way.
-- Sun Timer, 2022-01-27

[View all SunDay reviews and detailed analytics on AppTail](https://app.apptail.io/signup?utm_campaign=ai-crawl&utm_content=reviews)



## SunDay Discovered Keywords
- vitamin d
- uv tracker
- sunday

## Apps Similar to SunDay
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- [SmarTest Vitamin D](https://apptail.io/app/smartest-vitamin-d-Jqtb/united-states)
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## SunDay Available In
- [United States](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/united-states)
- [Armenia](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/armenia)
- [Russia](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/russia)
- [France](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/france)
- [Canada](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/canada)
- [Australia](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/australia)
- [Germany](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/germany)
- [Spain](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/spain)
- [Brazil](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/brazil)
- [China](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/china)
- [Egypt](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/egypt)
- [Qatar](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/qatar)
- [Romania](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/romania)
- [Ukraine](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/ukraine)
- [Saudi Arabia](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/saudi-arabia)
- [India](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/india)
- [Slovakia](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/slovakia)
- [Argentina](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/argentina)
- [Philippines](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/philippines)
- [Belgium](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/belgium)
- [United Kingdom](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/united-kingdom)
- [Croatia](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/croatia)
- [Hungary](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/hungary)
- [Indonesia](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/indonesia)
- [Ireland](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/ireland)
- [Israel](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/israel)
- [Iceland](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/iceland)
- [Italy](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/italy)
- [Jamaica](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/jamaica)
- [Japan](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/japan)
- [South Korea](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/south-korea)
- [Kuwait](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/kuwait)
- [Kazakhstan](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/kazakhstan)
- [Lebanon](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/lebanon)
- [Sri Lanka](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/sri-lanka)
- [Lithuania](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/lithuania)
- [Luxembourg](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/luxembourg)
- [Latvia](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/latvia)
- [North Macedonia](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/north-macedonia)
- [Mali](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/mali)
- [Macao SAR China](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/macau)
- [Mexico](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/mexico)
- [Malaysia](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/malaysia)
- [Nigeria](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/nigeria)
- [Netherlands](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/netherlands)
- [Norway](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/norway)
- [Nepal](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/nepal)
- [New Zealand](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/new-zealand)
- [Panama](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/panama)
- [Peru](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/peru)
- [Pakistan](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/pakistan)
- [United Arab Emirates](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/united-arab-emirates)
- [Portugal](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/portugal)
- [Paraguay](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/paraguay)
- [Sweden](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/sweden)
- [Singapore](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/singapore)
- [Slovenia](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/slovenia)
- [Poland](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/poland)
- [Angola](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/angola)
- [Austria](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/austria)
- [Azerbaijan](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/azerbaijan)
- [Bulgaria](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/bulgaria)
- [Bermuda](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/bermuda)
- [Belarus](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/belarus)
- [Switzerland](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/switzerland)
- [Chile](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/chile)
- [Colombia](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/colombia)
- [Czechia](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/czechia)
- [Denmark](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/denmark)
- [Dominican Republic](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/dominican-republic)
- [Algeria](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/algeria)
- [Ecuador](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/ecuador)
- [Estonia](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/estonia)
- [Finland](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/finland)
- [Ghana](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/ghana)
- [Greece](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/greece)
- [Guyana](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/guyana)
- [Hong Kong SAR China](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/hong-kong)
- [Uzbekistan](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/uzbekistan)
- [British Virgin Islands](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/british-virgin-islands)
- [Vietnam](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/vietnam)
- [South Africa](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/south-africa)
- [Thailand](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/thailand)
- [Tunisia](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/tunisia)
- [Türkiye](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/turkey)
- [Taiwan](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/taiwan)
- [Senegal](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/senegal)
- [Uruguay](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/uruguay)
- [Jordan](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/jordan)
- [Cyprus](https://apptail.io/app/sunday-vitamin-d-uv-tracker-ktgb/cyprus)

---

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