# Frontend Framework Decision Summary

**Date**: 2026-02-14
**Decision**: **React Native + React**

---

## Platform Strategy

### Primary: Mobile Apps (iOS + Android)
- Daily health tracking and data entry
- Health sensor integration (HealthKit, Health Connect)
- QR code scanning (lab results)
- Push notifications (reminders)
- Background sync

### Secondary: Web Browser
- Complex data visualization and charts
- Historical trend analysis
- Profile and family management
- Extensive reporting

---

## Framework Decision: React Native + React

| Criteria | React Native + React | Flutter | Native |
|----------|---------------------|----------|--------|
| Code Sharing | 70-80% | 0% | 0% |
| Development Cost | Low | Medium | High |
| Time to Market | Fast | Medium | Slow |
| Health Sensors | ✅ Excellent | ✅ Excellent | ✅ Excellent |
| QR Scanning | ✅ Excellent | ✅ Excellent | ✅ Excellent |
| Performance | Good | Excellent | Excellent |
| Team Skills | JS/TS only | Dart + JS | Swift + Kotlin + JS |
| Ecosystem | Largest | Large | Native |

---

## Key Advantages

### 1. Code Sharing (70-80%)
- Business logic: State, API, encryption
- Data validation: Zod schemas
- Date handling: date-fns
- Utilities: Monorepo shared package

### 2. Health Sensors
- iOS: react-native-health (HealthKit)
- Android: react-native-google-fit (Health Connect)
- Background sensor data collection

### 3. Encryption
- react-native-quick-crypto
- AES-256-GCM, PBKDF2
- Secure key storage (Keychain/Keystore)
- Web Crypto API compatible

### 4. QR Scanning
- react-native-camera
- Fast, accurate scanning

### 5. Web Charts
- Recharts (React)
- Beautiful, interactive visualizations
- Perfect for health data

### 6. Team & Cost
- Single language: JavaScript/TypeScript
- Single ecosystem: npm
- Lower development cost
- Faster time to market

---

## Technology Stack

### Mobile (React Native)
- Framework: React Native 0.73+
- Language: TypeScript
- Health: react-native-health, react-native-google-fit
- Camera: react-native-camera
- Encryption: react-native-quick-crypto
- HTTP: Axios

### Web (React)
- Framework: React 18+
- Language: TypeScript
- Charts: Recharts
- HTTP: Axios
- UI: Tailwind CSS / Chakra UI

### Shared (Monorepo)
- Language: TypeScript
- State: Redux/Zustand (TBD)
- API: Axios
- Encryption: AES-256-GCM, PBKDF2
- Validation: Zod
- Date: date-fns

---

## Implementation Timeline

### Phase 1: Mobile MVP (8-12 weeks)
- Setup React Native project
- Integrate HealthKit and Health Connect
- Implement encryption
- Build core UI
- Test QR scanning
- Background sync

### Phase 2: Web Companion (4-6 weeks)
- Setup React project
- Share business logic
- Build charts
- Profile management UI

### Phase 3: Polish & Launch (4-6 weeks)
- Performance optimization
- Security audit
- App store submission
- Beta launch

---

## Next Steps

1. ✅ Mobile Framework: React Native
2. ⏭️ State Management: Redux vs Zustand
3. ⏭️ Database Schema Design
4. ⏭️ Create Health Sensor POC
5. ⏭️ Implement Authentication

---

## Conclusion

**React Native + React** is optimal for Normogen:

- 70-80% code sharing reduces development cost
- Excellent health sensor integration
- Single language (JavaScript/TypeScript)
- Great chart visualization for web
- Faster time to market

**Decision**: Use **React Native** for mobile (iOS + Android) and **React** for web companion app.