Developing a Fantasy Sports App involves various factors impacting cost and features. According to Dev Technosys, core features include user registration, player stats, live score updates, team creation, in-app transactions, leaderboards, and social sharing options. Additional features like real-time notifications, chat systems, and payment gateways enhance user engagement. The development cost typically ranges between $15,000 to $50,000, depending on complexity, platform (iOS/Android), and tech stack (e.g., React Native, Node.js). Post-launch, regular updates, bug fixes, and user feedback integration are essential for maintaining app performance and attracting users, ensuring a sustainable business model.