I need a simple, reliable mobile application that reproduces the weight-calculator you see on https://petrosstone.com/stone-weight-calculator/ and makes it available on both Android and iOS. The layout, colours, and overall feel should mirror that page so users get a consistent experience across web and mobile. Core workflow • User enters slab length, width, and thickness (mm / cm options exactly as on the site). • They pick the stone type or directly enter its density. • On tapping “Calculate”, the app instantly returns the weight with the same precision the site provides. Publishing Once the build is signed off, I’ll need compiled releases uploaded to Google Play and the Apple App Store under my accounts. Please handle bundle creation, basic store listings (icon, screenshots that match the app’s look, short description, and privacy labels), and guide me through any provisioning profiles or certificates Apple requires. Deliverables 1. Full source code (Flutter, React Native, or native—whichever you’re most comfortable with) 2. Pixel-matched UI that reflects the example site 3. Accurate calculation module tested against several sample inputs from the website 4. Play Store APK/AAB and App Store IPA ready for review 5. Brief README covering build commands and future update steps Acceptance • UI alignment within ±2 px of the reference site on common devices • Calculation outputs identical to the web tool for identical inputs • Apps pass store review and appear live in both stores without critical issues If you’ve shipped cross-platform utilities before and can move quickly, let’s get started.