Gain days you can see — an on-device longevity dashboard that turns your health data into real-time life-expectancy deltas.
LifeDelta is a revolutionary iOS app that transforms passive health metrics into an engaging, privacy-first longevity dashboard. By combining actuarial life tables with on-device machine learning, it displays your remaining life expectancy and quantifies the impact of daily habits in concrete days gained or lost.
- Instant Meaning: A live countdown that moves when you walk, sleep, or quit vaping
- Actionable Clarity: Every habit shows a concrete "+ / – days" impact, not abstract scores
- Privacy by Default: All modeling happens on-device; no health data leaves your phone
- Built-in Virality: Shareable "+73 days gained" cards drive organic growth loops
- Life Countdown: Real-time countdown of remaining life days with live updates
- HealthKit Integration: Syncs steps, resting heart rate, sleep, and VO₂ max data
- Basic Dashboard: LifeScore overview with weekly deltas and top risk factors
- Weekly Digest: Email summaries of your progress and insights
- Habit Simulator: See how lifestyle changes impact life expectancy in real-time
- AR Food Scanner: Scan food to estimate nutritional impact on longevity
- Advanced Analytics: Detailed insights and trend analysis with SHAP explanations
- Shareable Cards: Generate viral "gains" cards with referral codes
- Streak Insurance: Protect your progress with gamified streak protection
- Data Export: Full GDPR-compliant data export and deletion
- 🔒 100% On-Device Processing: All health data processing happens locally
- 🔐 AES-256 Encryption: Device-key encryption for cached data
- ☁️ No Cloud Storage: Raw health data never leaves your device
- 📋 GDPR Compliant: Full data export and deletion capabilities
- 🛡️ No Data Sharing: We never share your health data with third parties
| Plan | Price | Features |
|---|---|---|
| Free | $0 | Life countdown, basic dashboard, weekly email |
| Pro | $19/year | Full HealthKit sync, habit simulator, AR scanning, advanced analytics, data export |
| Layer | Technology | Purpose |
|---|---|---|
| Frontend | SwiftUI + Combine | Modern iOS development |
| ML | Core ML + scikit-survival | On-device survival analysis |
| Backend | FastAPI + Supabase | Micro-coach & auth |
| Automation | n8n + Resend | Email digests |
| Payments | Stripe | Subscription management |
| Analytics | PostHog | User behavior tracking |
- Xcode 15.0+ with iOS 17.0+ SDK
- iOS 17.0+ device or simulator
- HealthKit enabled device for full functionality
- Clone the repository:
git clone https://github.com/yourusername/lifedelta.git
cd lifedelta- Open in Xcode:
open LifeDelta.xcodeproj- Build and run:
- Select your target device
- Press
Cmd + Rto build and run
The app requires HealthKit permissions for optimal functionality:
| Data Type | Purpose | Required |
|---|---|---|
| Step Count | Activity tracking | ✅ Yes |
| Heart Rate | Cardiovascular health | ✅ Yes |
| Sleep Analysis | Sleep quality metrics | ✅ Yes |
| VO₂ Max | Fitness level assessment | ✅ Yes |
| Body Mass | BMI calculations | ✅ Yes |
| Height | BMI calculations | ✅ Yes |
LifeDelta/
├── 📱 LifeDeltaApp.swift # Main app entry point
├── 🏠 ContentView.swift # Root view with tab navigation
├── 📊 Models/
│ └── HealthData.swift # Data models and structures
├── ⚙️ Managers/
│ ├── HealthManager.swift # HealthKit integration
│ ├── LifeDeltaModel.swift # ML model and calculations
│ └── SubscriptionManager.swift # In-app purchases
├── 🎨 Views/
│ ├── OnboardingView.swift # User onboarding flow
│ ├── DashboardView.swift # Main dashboard
│ ├── HabitSimulatorView.swift # Habit impact simulator
│ ├── ARScannerView.swift # Food scanning interface
│ ├── ProfileView.swift # User profile and settings
│ └── PaywallView.swift # Subscription paywall
└── 🎨 Assets.xcassets/ # App icons and colors
┌────────────┐
│ SwiftUI App│
└─────┬──────┘
│ Core ML .mlmodel (on-device)
│
┌─────▼──────┐ ┌─────────────┐
│ Local Cache│◄──RLS──►│ Supabase │ (auth, anon telemetry)
└────────────┘ └─────────────┘
│ ▲
│ POST /micro-coach │ Webhook
▼ │
┌────────────┐ │
│ FastAPI │──► GPT-4o ◄─────┘
│ (Fly.io) │
└────────────┘
- Project setup and basic structure
- HealthKit integration
- Core ML model integration
- Basic UI components
- Onboarding flow
- Habit simulator with real-time updates
- AR food scanning implementation
- Shareable OG-card generation
- Stripe paywall integration
- Advanced analytics dashboard
- Weekly digest email system (n8n + Resend)
- Beta testing with TestFlight (100 users)
- PostHog analytics integration
- Performance optimization
- App Store submission
- Product Hunt launch
- Social media marketing
- User feedback integration
| Metric | Target | Current |
|---|---|---|
| Activation Rate | ≥70% | TBD |
| WAU/MAU | ≥50% | TBD |
| Free→Pro Conversion | ≥3% | TBD |
| K-factor (Referrals) | ≥0.25 | TBD |
| Model MAE | ≤7 years | TBD |
We welcome contributions! Please follow these steps:
- Fork the repository
- Create a feature branch (
git checkout -b feature/amazing-feature) - Commit your changes (
git commit -m 'Add some amazing feature') - Push to the branch (
git push origin feature/amazing-feature) - Open a Pull Request
- Follow Swift style guidelines
- Add tests for new features
- Update documentation as needed
- Ensure privacy-first principles
This project is licensed under the MIT License - see the LICENSE file for details.
| Channel | Contact |
|---|---|
| support@lifedelta.app | |
| 🌐 Website | https://lifedelta.app |
| ❓ Help Center | https://lifedelta.app/help |
| 🐛 Bug Reports | GitHub Issues |
- HealthKit framework for health data integration
- Core ML for on-device machine learning
- SwiftUI for modern iOS development
- The longevity research community for data and insights
- EZ MONEY for the vision and execution
Made with ❤️ by the EZ MONEY team
Gain days you can see
Gain days you can see