Daj krv

Your data and choices

Privacy Policy

Politika privatnosti

Политика конфиденциальности

Effective: September 8, 2026 · Version 1.0

1. Who operates Daj krv

Daj krv is operated by Evgenii Kuzin (“we”, “us”). For privacy questions or requests, contact dajkrv@proton.me. Daj krv is an independent personal tracker and is not operated by Serbia’s Institute for Blood Transfusion (ITKS).

2. Data stored only on your device

You can use Daj krv without an account. In local mode, your donor profile, donation history, plans, preferences, and notes are stored in the app’s local SwiftData database. They are not uploaded for synchronization. Removing the app normally removes this local copy.

Device motion is used transiently to animate the blood-reserve drop. Motion values are not stored or transmitted. The app does not read HealthKit or your contacts and does not request your current location.

This publication website stores only your selected display language in browser local storage. It has no advertising, website analytics, or tracking cookies.

3. Optional account and synchronization

If you choose Apple or Google sign-in, the authentication provider and Firebase Authentication process an account identifier and any name or email address made available by the provider. Daj krv then synchronizes the profile information and donation records you enter, including name, city, optional date of birth, sex used for interval calculations, blood group, donation dates, types, places, plans, and notes.

The synchronized copy is stored in Google Cloud Firestore under your account identifier. It is used to authenticate you, synchronize records, personalize the tracker, and restore your history on your devices. Transport connections use TLS, and database rules restrict each record to its authenticated owner.

4. Anonymous analytics and crash reports

Anonymous analytics and crash reporting are enabled by default. You can disable them on the initial sign-in choice screen or later in Profile. Firebase Analytics processes opened section names, technical app and device information, and an approximate region inferred by the service; the app does not request device location. Firebase Crashlytics processes crash traces and related app, operating-system, and device diagnostics.

We do not add your account identifier, name, blood group, sex, entered city, birth date, donation dates, donation types, places, notes, coordinates, or motion values to analytics or crash reports. This information is used only to understand aggregate feature use and diagnose reliability problems, not for advertising or cross-app tracking. When you disable the setting, the app stops collection, resets its local analytics identifier, and deletes unsent crash reports.

5. Public information and maps

The app downloads public blood-reserve, eligibility, contact, and donation-event information from ITKS. Event address text may be sent to Apple Maps system search to find map coordinates. If you choose to open Apple Maps, Google Maps, or Yandex Maps, that provider processes the destination under its own privacy terms.

6. Service providers and international processing

Google Firebase provides cloud authentication, Firestore storage, App Check, analytics, and crash reporting. Apple and Google process sign-in data when you choose their sign-in services. These providers may process technical or account data in countries outside your residence under their own legal safeguards and privacy terms.

Firebase privacy · Apple privacy · Google privacy

7. Retention and deletion

Local information remains until you delete records or remove the app. Synchronized information remains until you delete your account. Signing out does not delete the cloud copy. To delete it, open Profile → Delete account and all data. After fresh authentication, the app deletes your Firestore donor document, Firebase Authentication account, and local donor data; for an Apple account, it also asks Apple to revoke the authorization token.

Processor-controlled backups and security logs may remain for limited periods under provider retention policies and legal obligations.

8. Your choices and rights

You can use local mode, omit optional profile fields, edit or delete records, disable anonymous analytics, sign out, or delete your account in the app. Depending on applicable law, you may also request access, correction, deletion, restriction, or a portable copy of personal data and object to certain processing. Contact dajkrv@proton.me. We may need to verify that a request belongs to the account concerned.

9. Children and medical information

Daj krv is not directed to children. It is a personal record-keeping tool, not a medical service, and does not determine whether you are eligible to donate. Always follow current ITKS guidance and advice from qualified healthcare professionals.

10. Changes

We may update this policy when the app or legal requirements change. Material changes will be reflected by a new effective date and an updated version at this URL.