Privacy Policy for Simple Weight Tracker

Status: May 1, 2026

We are honored that you have chosen Simple Weight Tracker to support your health journey. Because body weight is sensitive health data, we built this app with a strict, privacy-first, offline-only architecture. Below, we detail exactly how the app handles your data, how it is structured, and how your privacy is protected under the General Data Protection Regulation (GDPR).

1. Data Controller

The entity responsible for data processing in accordance with the General Data Protection Regulation (GDPR) is:

Sick App Developers GmbH Messeler-Park-Straße 85 64291 Darmstadt Germany Email: simpleweighttracker@sickappdevelopers.com

2. Health Data and Local Storage (Zero Cloud Collection)

Under Article 9 of the GDPR, health data is considered „Special Category Data“ and requires the highest level of protection. We ensure this by operating offline-first and entirely locally.

We, the developers, do not collect, transmit, store, or have any access to your user data on external servers. The app does not share your health data with third-party health aggregators like Apple HealthKit or Google Fit.

Body Weight Logs

  • What it is: Decimal numerical values (your weight), calendar timestamps, and auto-generated unique identifiers (UUIDs).
  • Example: {"id": "550e8400-e29b-41d4-a716-446655440000", "weight": 75.5, "timestamp": "2026-05-01T08:30:00Z"}
  • Usage: This data is saved exclusively inside a secure, sandboxed local SQLite database (sqflite) directly on your physical device. It is used solely to generate your personal progress charts and history list. The only way this data leaves the app is if you explicitly choose to trigger the „Export CSV“ function to share a local file via your device’s native sharing sheet.

General App Preferences

  • What it is: Text strings, time values, and boolean (true/false) toggles.
  • Example: {"weightUnit": "kg", "reminderTime": "08:00", "hapticsEnabled": true, "theme": "dark"}
  • Usage: Stored locally to remember your preferred units of measurement, aesthetic choices, and notification settings.

3. Device Permissions Used

To function properly, the app requests the following permission on your device:

Notifications

  • What it is: A system-level permission to display alerts on your screen.
  • Usage: The app requests this to send you daily reminders to log your weight. These are strictly Local Notifications. They are scheduled dynamically by your device’s own processor. Absolutely no data is sent to external notification servers like the Apple Push Notification service (APNs) or Firebase Cloud Messaging (FCM).

4. Third-Party Data Processors (In-App Purchases)

If you choose to upgrade to our Premium tier, payment processing is handled entirely by the respective app store platform.

Subscription State

  • What it is: A local boolean value and text string confirming your purchase tier.
  • Example: {"isPremiumActive": true, "tier": "lifetime_pro"}
  • Usage: We do not collect, process, or store credit card information, names, or billing addresses. All financial transactions are executed securely by Apple (App Store) or Google (Play Store). The app only stores a local state variable to unlock the premium features on your device.

5. Analytics, Telemetry, and Ads (None)

We guarantee that Simple Weight Tracker features:

  • No Analytics or Tracking: We do not use any third-party analytics SDKs (such as Firebase Analytics, Google Analytics, or Crashlytics). We do not track your user behavior, screen taps, or device identifiers.
  • No Advertisements: The app is ad-free and does not share any information with advertising networks.

6. Your Rights as a Data Subject

Under the GDPR, you have complete rights over your personal data. Because your health data and preferences are stored exclusively on your own device, you have immediate and total control over them:

  • Right to Erasure (Art. 17 GDPR): You can instantly and permanently delete all of your body weight logs and preferences simply by uninstalling the app or clearing the app’s local data in your device settings. We hold no remote backups to delete on our end.
  • Right of Access & Rectification (Art. 15 & 16 GDPR): You have full, direct access to view, edit, or delete any specific weight entry through the app’s interface at any time.

For any inquiries regarding data protection, please contact us at simpleweighttracker@sickappdevelopers.com.