3.2.3 Safe to install
Stay Sunny: SunDay Helps You Track Your Vitamin D and UV Exposure

SunDay by Heuristic Innovations is an innovative app designed to help users monitor their vitamin D levels and UV exposure effectively, making it easier to maintain optimal health throughout the year.
Vitamin D management made simple. SunDay offers an integrated solution for monitoring your daily intake of Vitamin D, tracking progress, and fostering healthy habits.
SunDay ensures your safety under the sun with its smart Timer feature, helping you stay protected against sunburn risks while enjoying the outdoors. For a hands-free experience, consider the stylish SunDay necklace accessory to automate calculations wherever you go.
Enhance your health journey with additional Vitamin D supplements by seamlessly incorporating them into your account for detailed insights into your Vitamin D levels.
How It Works:
- Scan the Sun
- Activate the timer
- Receive alerts for session completion
- Achieve your daily vitamin D goal
- Monitor progress
- Cultivate healthy practices
Features:
- Solar UV Scanner
- Sun Finder (for overcast conditions)
- Session Timer and Calculator
- Vitamin D Supplements Calculator
- Vitamin D Supplements reminders
- Daily goals and reminders
- Profile customization
- Progress stats and achievements
- Necklace integration
Your customized calculations take into account skin type, age, weight, and clothing choices for utmost precision in determining your Vitamin D intake while in direct sunlight.
In addition to shielding against skin damage, SunDay reveals the Vitamin D IU you absorb during sun exposure.
Our Objectives:
- Raise awareness about the advantages of naturally obtained Vitamin D
- Combat Vitamin D deficiency in individuals of all ages
- Promote outdoor familial activities for healthier lifestyles
Disclaimer:
SunDay is an educational tool and should not be used as a substitute for professional medical advice. Consult a healthcare provider before making any health-related decisions based on the app's calculations of daily Vitamin D intake.
Overview
SunDay: Vitamin D & UV Tracker is a Freeware software in the category Home & Hobby developed by Heuristic Innovations.
The latest version of SunDay: Vitamin D & UV Tracker is 3.2.3, released on 06/03/2025. It was initially added to our database on 03/30/2024.
SunDay: Vitamin D & UV Tracker runs on the following operating systems: iOS.
Users of SunDay: Vitamin D & UV Tracker gave it a rating of 4 out of 5 stars.
Pros
- User-friendly interface that makes it easy to track vitamin D levels and UV exposure.
- Offers personalized recommendations based on user data and location.
- Provides informative insights about the importance of vitamin D and safe sun exposure.
- Allows users to set reminders for sun exposure times to optimize vitamin D synthesis.
- Includes a feature to log outdoor activities, which can help in keeping track of UV exposure over time.
Cons
- Limited functionality without a premium subscription, which may deter some users.
- Data accuracy may depend on GPS capabilities, which could be affected by device performance or settings.
- Some users may find the notifications overwhelming if too frequent or poorly timed.
- Lack of integration with other health apps may limit comprehensive health tracking for users.
- Could have limited utility in regions with minimal sunlight throughout the year.

Boris Weber
I am an editor at UpdateStar. I started as a support engineer, and am now specialized in writing about general software topics from a usability and performance angle among others. I telecommute from UpdateStar’s Berlin office, when I am not working remote as a digital nomad for UpdateStar. When I'm not analyzing the latest software updates, you can find me exploring new cities, immersing myself in local cultures, and discovering innovative tech trends across the globe.
Latest Reviews by Boris Weber
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