Research: React Native + React selected for mobile and web

- Completed mobile-first platform strategy research
- React Native selected for iOS and Android mobile apps
- React selected for web companion app
- 70-80% code sharing between mobile and web
- Excellent health sensor integration (HealthKit, Health Connect)
- QR scanning, encryption, and background sync support
- Created comprehensive frontend research documentation
- Updated README with platform strategy
- Updated tech stack decisions

Key advantages:
- Single language (TypeScript) reduces development cost
- 70-80% code sharing between mobile and web
- Excellent health sensor integration
- Great chart visualization for web companion
- Faster time to market

Next: State management research (Redux vs Zustand)

thoughts/research/2026-02-14-frontend-decision-summary.md

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+# 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.