deklerkvincent70-stack/fieldconvert

Mobile-first unit conversion platform and PWA for engineering, construction, farming, mining, trades, education, and African markets. # ConcreteMix Pro Production-ready offline-first concrete calculator for contractors, builders, owner-builders and onsite crews. The app opens directly to the calculator, stores all data locally, installs as a PWA, and keeps working after installation without a backend, login, cloud sync or live currency service. ## Run Locally ```powershell npm install npm run dev ``` Open localhost. ## Production Checks ```powershell npm run typecheck npm run build npm start ``` ## What Is Included - Mobile-first React + Next.js PWA with install metadata and offline service worker. - Concrete volume calculator for slab, circle, column, beam, stair and custom volume. - Purpose-based MPa, PSI, mix ratio and cement type recommendations. - Built-in strength database from 5 MPa to 30 MPa+ design mix guidance. - Cement, sand, aggregate, water, bags, mixer loads and wheelbarrow estimates. - Offline cost calculator with local currency symbol and saved prices. - Settings for dark/light mode, units, bag size, wastage, dry factor, water-cement ratio, densities and site capacities. - Local-only persistence through browser storage for settings, costs and saved estimates. - Printable PDF workflow through the browser print dialog, plus native share where supported. ## Sample Calculation Default slab example: - Shape: rectangle slab - Dimensions: 4 m x 3 m x 0.1 m - Wet volume: 1.2 m³ / 1,200 liters / 42.38 ft³ - Purpose: domestic slab - Recommended strength: 20 MPa / 2,900 PSI - Ratio: 1 : 1.5 : 3 - Dry volume factor: 1.54 - Default wastage: 5% ## Screenshots - Mobile: `public/screenshots/mobile.svg` - Desktop: `public/screenshots/desktop.svg` ## Build Targets ### Web PWA ```powershell npm run build npm start ``` Deploy the built Next.js app to any static/server Next host. The PWA manifest and `public/sw.js` provide install and offline behavior. ### Android APK and iOS This codebase is ready for the React + Capacitor route. Add Capacitor when native packaging is ne …