Developing a field booking app like Turf Booking involves significant costs and features. The cost can vary widely depending on the app's complexity, features, and platform (iOS, Android, or both). Essential features include user registration and login, field availability and booking, payment integration, notifications, and field management. Additional features like reviews, ratings, and social media integration can enhance user experience. The cost also depends on the choice of development team, design, and backend infrastructure. Overall, developing a field booking app can be a substantial investment, but it can also offer a lucrative business opportunity.