I propose developing a custom taxi app for iOS and Android with features including driver-rider matching, secure payment processing, real-time ride tracking, fare estimation, in-app messaging, ride scheduling, driver ratings, and multi-language support. The app will also feature an SOS button, ride history, promo codes, ride-sharing, and push notifications. A unique, user-friendly design will be developed, with cross-platform support using Flutter to ensure cost-effectiveness. Backend services will be built using Python (Flask/Django), with a PostgreSQL database for scalability. The app will prioritize security with SSL encryption and data protection. Development will take around 3 months, with post-launch support for 6 months. Ongoing maintenance and updates can be discussed. I offer a milestone-based pricing plan to keep costs transparent and manageable, ensuring high-quality results within your budget.