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Cases
Weight by Day
Private-by-design calorie calculator and weight tracker.
Problem
The most popular weight-tracking apps require an account, sync sensitive data to the cloud and show ads next to health information. Users who care about privacy could not find a simple alternative.
Solution
We built an app that runs 100% on the device: calorie calculation, target weight, daily progress. No login, no servers, no third-party SDKs.
Stack
- Flutter
- Dart
- Local SQLite
- Google Play Console
Results
- Shipped to Google Play without a single dangerous permission.
- Zero calls to external services at runtime.
- A privacy policy that fits on one page: "we collect nothing".
Privacy
- Health data never leaves the device.
- No analytics, no tracking, no ads.
- No user account.