DUK-C | Clinical Decision Support for Physicians

Evidence-based clinical guideline pearls, EKG interpretation education, medical risk calculators, and diagnostic decision support tools for physicians and clinicians.

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Privacy Policy

Last updated: June 30, 2026
DUK-C is developed and published by Marko Lazović (“we,” “us,” “the developer”). This Privacy Policy explains what information we do and do not collect and how it is handled.
Summary: DUK-C does not require an account or login. We do not sell your personal information, and we do not show ads. Your saved items and any patient-context notes are stored locally on your device, not on our servers.

Contents

1. Information We Do Not Collect
2. Information Collected Automatically
3. Content Delivery
4. How We Use Information
5. Third-Party Services
6. Data Storage and Retention
7. Children’s Privacy
8. Your Choices and Rights
9. Medical Disclaimer
10. Changes to This Policy
11. Contact Us

1. Information We Do Not Collect

DUK-C does not require you to create an account, and we do not ask for your name, email, or contact information to use the app. We do not collect or store the clinical notes or "patient context" information you enter — that data remains on your device only, in the app’s local storage, and is not transmitted to us. Deleting the app removes this information.

2. Information Collected Automatically

•
Purchase information. One-time purchases (such as "Unlock Forever") are processed by Apple and managed through RevenueCat, our in-app purchase provider. To deliver and restore your purchase, RevenueCat and Apple process information such as purchase history, an anonymous app-user identifier, and device and transaction details (including IP address, used for fraud prevention and entitlement management). We do not receive your Apple ID or payment card information. Please review Apple’s and RevenueCat’s privacy policies for details on their handling of this data.
•
Usage and diagnostic data. We use standard mobile app analytics and crash-reporting tools provided through our development platform (Expo) and Apple to collect aggregated, non-identifying information about how the app is used — such as feature usage, app version, device type, and crash diagnostics — solely to maintain and improve the app. This information is not used to identify you personally.

3. Content Delivery

DUK-C’s clinical reference content (such as guideline summaries, treatment protocols, and reference entries) is delivered from our backend hosting provider, Supabase. Because DUK-C has no user accounts, we do not associate content requests with an identified user. As with any internet-connected service, standard technical information (such as IP address) may be processed to deliver content and maintain security. We do not store personal profiles of users on our servers.

4. How We Use Information

We use the limited information described above to: deliver and restore purchases, operate and secure the app, diagnose and fix technical problems, and understand aggregate usage to improve features. We do not use your information for advertising, and we do not sell it.

5. Third-Party Services

DUK-C relies on the following third-party services, each governed by its own privacy policy: Apple (app distribution and payments), RevenueCat (in-app purchase management), Supabase (content hosting), and Expo (development and app analytics/diagnostics). We encourage you to review their respective privacy policies to understand how they handle data.

6. Data Storage and Retention

Saved items and patient-context notes are stored locally on your device and are removed when you delete the app. We do not maintain server-side personal profiles. Purchase records are retained by Apple and RevenueCat in accordance with their policies.

7. Children’s Privacy

DUK-C is intended for use by healthcare professionals and is not directed to children under 13. We do not knowingly collect personal information from children. If you believe a child has provided us personal information, contact us at the address below.

8. Your Choices and Rights

Because we do not maintain user accounts or server-side personal profiles, most data stays under your control on your device. To remove locally stored data, delete the app. For questions regarding purchase data, you may also contact Apple or RevenueCat directly. Depending on your jurisdiction (for example, under the GDPR or CCPA), you may have rights to access, correct, or delete personal data. To exercise any such rights, contact us at support@dukc.app, and we will respond as required by applicable law.

9. Medical Disclaimer

DUK-C is an educational and reference tool intended for healthcare professionals. It does not provide medical advice and is not a substitute for professional clinical judgment. All content is for educational purposes only. Please see our Terms & Conditions for the full disclaimer.

10. Changes to This Policy

We may update this Privacy Policy from time to time. Material changes will be reflected by updating the "Last updated" date at the top of this page. Your continued use of the app after changes take effect constitutes acceptance of the revised policy.

11. Contact Us

Marko Lazović
Email: support@dukc.app
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DUK-C provides educational content and clinical decision support. It does not provide medical advice and is not a substitute for clinician judgment.
© 2026 Marko Lazović. All rights reserved.