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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


• 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


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.

What’s New

Version 3.2.1

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

App Privacy

The developer, Heuristic Innovations, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer's privacy policy.

Data Not Linked to You

The following data may be collected but it is not linked to your identity:

  • Identifiers
  • Usage Data
  • Diagnostics

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    Up to six family members will be able to use this app with Family Sharing enabled.

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