Privacy Policy

This privacy policy governs your use of the software application dminder ("Application") for mobile devices, created by Ontometrics. The Application is a comprehensive Vitamin D tracking app that uses your device's GPS to determine your location, computes when you can produce Vitamin D from the sun, tracks how much you make, provides a session timer, and estimates your blood Vitamin D level on an ongoing basis.

What Data Does dminder Collect?

User Profile Information

When you set up dminder, you provide personal information used to personalize Vitamin D calculations:

• Name — for display within the app
• Date of birth — age affects Vitamin D synthesis rates
• Biological sex — influences calculation parameters
• Skin type (Fitzpatrick I–VI) — determines UV sensitivity and burn time
• Height and weight — body composition affects Vitamin D metabolism

If you use a health platform (Apple Health on iOS, Health Connect on Android), the Application may read height and weight from there with your permission.

Sun Session History

Each sun session records:

• Start and end times
• Location (latitude, longitude, timezone)
• UV conditions (UV index, solar elevation, ozone levels)
• Skin exposure percentage and clothing configuration
• Vitamin D produced (IU)

Supplement Doses

Timestamps and dosage amounts (IU) for any Vitamin D supplements you log.

Food Doses

Timestamps, food names, and Vitamin D amounts (IU) for dietary Vitamin D you log.

Lab Results

If you enter blood test results, the app stores sample dates, Vitamin D levels (ng/mL), and any other markers you provide. These are used to calibrate the D level estimator.

Device Information

For crash reporting and diagnostics, we collect device model, operating system version, and crash stack traces via Firebase Crashlytics. This data is anonymous and cannot be tied to your health information.

Anonymous Analytics

Firebase Analytics collects anonymous usage data (screen views, feature usage patterns) to help us improve the app. This data is aggregated and does not identify individual users.

Diagnostic Logs

To find and fix bugs, the app sends small diagnostic events to our own server (hosted on Google Cloud in the United States). Each event carries a random identifier created when the app is installed, the app version, the event name, and the numbers involved in that event. For example, if a vitamin D calculation fails, the event can include the inputs it used, such as skin type, weight and height. Diagnostic events never include your name, email address or location coordinates. They are sent from both the free version and Pro.

Location Data

The Application uses your device's location to calculate solar position, UV index availability, and ozone levels at your coordinates. Location data is used locally for these calculations and is stored as part of your session history. Your coordinates are never included in our diagnostic logs (see Diagnostic Logs below). If you use cloud sync or encrypted backup (D-Minder Pro), your saved location and session locations are included in that data. In the free version, our advertising partner may receive your approximate location (see Third-Party Services below). To work out conditions where you are, the app sends your coordinates to these lookups: our elevation service, our ozone service (only when the downloaded ozone map can't answer), a time zone service (Google, on Android), Apple Weather (iPhone), and your phone's map service (Apple or Google) to name the place and when you search for one. These lookups don't include your name or email.

Free Version — Data Stays on Your Device

In the free version:

• Your history is stored on your device (and, on iOS, in your own iCloud account if you use iCloud). Small diagnostic events are sent to our servers; they never include your name, email address or coordinates (see Diagnostic Logs).
• The history UI shows a 90-day rolling window of sessions.
• You can export all your data at any time in JSON or CSV format via the in-app export feature.
• Ads are displayed via Google AdMob (see Third-Party Services below).

D-Minder Pro — Cloud Sync and Backup

D-Minder Pro removes ads. On Android, Pro also syncs your data to Google Cloud Platform (Firestore) for backup and cross-device access. On iPhone, Pro includes an encrypted backup stored on our servers, and cross-platform sync with Android is an optional add-on. Cloud data is handled as follows:

• Storage region: United States
• Encryption in transit: TLS 1.3
• Encryption at rest: AES-256 (GCP default encryption)
• User isolation: Firestore security rules enforce strict user-level data isolation. No one at Ontometrics can view individual user data. Each user's documents are accessible only via their authenticated account.
• Data retention: Your cloud data is retained while your subscription is active, plus 90 days after your subscription lapses. We send warning emails at 60 days and 80 days after lapse. After 90 days, cloud data is permanently deleted.
• No ads: Pro users do not see advertisements.

Third-Party Services

dminder integrates with the following third-party services:

Your Rights (GDPR / CCPA)

Regardless of where you live, we respect your data rights:

• Right to access: You can export all your data at any time using the in-app export feature (JSON or CSV format).
• Right to erasure: In the app, Settings → Delete Cloud Data deletes your iCloud data or Google Drive backups and our encrypted backups, and shows what was deleted; Delete Account & Data also removes everything on your phone (iPhone version 100.11.11 or later, Android 10.10.8 or later). Diagnostic archive copies are deleted automatically within 30 days. You can also email support@ontometrics.com with the subject "Data Deletion Request" and we will delete your cloud data within 30 days. See Data Deletion Request for details.
• Right to data portability: The in-app export produces standard JSON and CSV files that you can import into other tools.
• Right to opt out of cloud storage: Cancel Pro at any time. Your data will revert to local-only storage after the retention period.
• Right to opt out of analytics: You can disable analytics collection in Settings.
• Right to opt out of personalized ads: Adjust ad personalization in your device settings, or get D-Minder Pro to remove ads entirely.

Data deletion requests are processed within 30 days of receipt.

Children's Privacy

dminder is not directed to children under the age of 13. We do not knowingly collect personal information from children under 13. If you believe a child under 13 has provided us with personal data, please contact us at info@ontometrics.com and we will promptly delete it. We do not engage in COPPA-regulated data collection.

Security

We take data security seriously:

• Local data is protected by your device's built-in encryption and access controls.
• Cloud data is encrypted in transit (TLS 1.3) and at rest (AES-256).
• Firestore security rules prevent cross-user data access.
• We do not store passwords in plaintext. Firebase Auth handles all credential management.
• We conduct periodic reviews of our security practices.

Data Retention

• Local data: Retained on your device until you delete the app or clear app data.
• Cloud data (Pro): Retained while your subscription is active, plus 90 days after lapse. Warning emails are sent at 60 and 80 days post-lapse.
• Crash reports: Retained by Firebase Crashlytics for 90 days.
• Analytics data: Retained by Firebase Analytics per Google's standard retention policies (14 months for user-level data, aggregated data retained indefinitely).
• Health platform data: If you use Apple Health or Health Connect, deleting dminder will prompt you to choose whether to keep the data the app wrote to the health store.

Changes to This Policy

We may update this Privacy Policy from time to time. Changes will be posted on this page with an updated "Last Updated" date. For material changes, we will include a notice in the app's release notes. Continued use of the Application after changes constitutes acceptance of the updated policy.

Your Consent

By using dminder, you consent to the collection and use of your information as described in this Privacy Policy. If you reside outside the United States, your information may be transferred to and processed in the United States.

Contact Us

If you have any questions about this Privacy Policy or your data, please contact us:

• Email: info@ontometrics.com
• General inquiries: info@ontometrics.com

Medical Disclaimer

D-Minder is not a medical device and is not intended to diagnose, treat, cure, or prevent any disease. Vitamin D estimates are based on published research and may not reflect your individual physiology. Always consult your healthcare provider before making changes to your sun exposure, supplement intake, or health regimen. Do not use D-Minder as a substitute for professional medical advice.