I’m building a focused numerology app whose single goal is to calculate core numbers accurately and present them in a clean, mobile-friendly interface. The app must handle Life Path Number, Destiny Number, Personal Year, the classic Pythagorean Arrows, and the Yantra grid. No elaborate user accounts are necessary—just collect the basic details (name and date of birth) in one step and run the calculations on-device so results appear instantly. Key expectations • Intuitive input screen that validates name and birth-date formats • Well-documented calculation engine covering the five items above • Results page that shows each number or pattern with a brief one-line label (readings and daily tips may come later, so keep the UI modular) • Lightweight data handling: store nothing beyond the single session unless it’s essential for the calculation itself • Smooth performance on both Android and iOS (feel free to suggest React Native, Flutter, or a native path—whatever you’re fastest with) Acceptance criteria The build is complete when I can install the app, enter sample data, and receive correct outputs for all five calculations that match standard numerology tables within a 1-point tolerance where rounding applies. Source code, build instructions, and a short README are part of the final hand-off.