Terms of Use (EULA)

Last updated: May 24, 2026

1. Acceptance of Terms

By downloading or using the D3-Sync app, these terms will automatically apply to you. You should make sure therefore that you read them carefully before using the app.

2. Medical Disclaimer

D3-Sync is not a medical device. The calculations for Vitamin D3 synthesis are estimates based on scientific models regarding UV index, skin type, and exposure time. This app does not provide medical advice, diagnosis, or treatment. Always consult with a qualified healthcare professional for medical advice and before making changes to your health regimen or sun exposure habits.

3. Subscriptions (Pro Version)

Some features of D3-Sync may be offered on a subscription basis ("Pro").

• Payment will be charged to your Apple ID account at the confirmation of purchase.
• Subscription automatically renews unless it is canceled at least 24 hours before the end of the current period.
• You can manage and cancel your subscriptions by going to your account settings on the App Store after purchase.

4. Changes to This Agreement

We may update our Terms of Use from time to time. Thus, you are advised to review this page periodically for any changes. We will notify you of any changes by posting the new Terms of Use on this page.

5. Contact Us

If you have any questions or suggestions about our Terms of Use, do not hesitate to contact us.