Fitness Tracking App
A weight and fitness tracking app that makes slow progress feel visible. Users set a goal weight, log entries over time, and see monthly charts, cumulative achievement and calendar history — with all health data encrypted at rest and in transit.
7.00 kg
Tracked progress
Cumulative loss represented in the sample user journey.
56 → 63 kg
Goal framing
Current and target weight surfaced together on every screen.
Encrypted
Data handling
Health records encrypted at rest and in transit, with user-controlled export.
Project overview
Weight change is slow, noisy and easy to give up on. A user who loses 400 grams in a week sees a number that looks like nothing, and a scale that fluctuates two kilos with hydration reads as failure. The entire design problem in this category is presenting genuinely slow progress in a way that sustains motivation without misrepresenting the data. We built the app around trend visualisation and cumulative achievement rather than day-to-day readings, so the user sees the direction of travel instead of the noise.
The problem
Users abandon weight tracking apps within weeks because individual daily readings are discouraging and meaningless in isolation. The client needed an app that kept people logging long enough for the underlying trend to become visible — while handling sensitive health data responsibly.
How we built it
Our approach on this project
- 1
Trend over reading
The dashboard leads with cumulative change against the goal and a monthly trend line, not today's number. This reframes a noisy daily metric as visible directional progress.
- 2
Goal framing
Users set a target weight up front, and every view expresses progress relative to that target — distance covered and distance remaining — rather than as an absolute figure.
- 3
Calendar history for consistency
A month calendar view shows logging consistency, which turns the habit itself into something visible and rewardable independent of the weight result.
- 4
Local-first storage with cloud sync
Entries write locally first so logging never blocks on connectivity, then sync to the cloud for backup and multi-device continuity.
- 5
Privacy by default
Health data is encrypted in transit and at rest, is not shared with third parties, and users can export or delete their full history — appropriate handling for a category that collects sensitive personal information.
Engineering detail
Challenges we hit, and how we solved them
!Challenges
- Creating motivating visualizations
- Data persistence and syncing
- User engagement over time
- Privacy and data security
✓Solutions
- Implemented engaging chart components
- Used local and cloud storage
- Added achievement notifications
- Ensured encrypted data storage
Technologies
Tech stack used
Features
Key features implemented
Weight loss progress tracking (7.00 kg lost)
Current weight display (56 kg)
Goal weight setting (63 kg)
Monthly progress charts
Total achievement tracking
Calendar view for logging history
Visual progress indicators
Personalized greetings and milestone notifications
What the client received
Cross-platform iOS and Android application
Goal setting with progress-to-target visualisation
Monthly trend charts built on Chart.js
Calendar-based logging history
Achievement and milestone notifications
Encrypted local and cloud data storage with export and delete
Results
Users reporting consistent tracking
High retention rates
Positive health outcomes
Featured in fitness app lists
Services used
The capabilities behind this project
Need something similar? These are the services this build drew on.
Questions about this project
Does the app integrate with Apple Health or Google Fit?
Integration with Apple HealthKit and Google Fit is supported as an option. It is worth deciding early, because reading from those sources changes both the data model and the permissions and privacy disclosures the app has to make at review time.
How is sensitive health data protected?
Data is encrypted in transit and at rest, stays scoped to the individual user account, and is not shared with third parties. Users can export or permanently delete their entire history from within the app.
How long does a tracking app like this take to build?
This one took three months with a team of three. A comparable tracking app — goal setting, logging, charts, notifications, cloud sync — usually lands in the eight-to-twelve-week range depending on how much wearable or third-party health integration is in scope.
More work