The cost to develop an on-demand file sharing app depends on several factors like file size support, encryption, storage options, user authentication, and real-time synchronization. Adding advanced features like cross-platform compatibility, cloud integration, and automated backup will increase the development cost. The more complex the features, the higher the overall cost. For businesses seeking a reliable and secure file-sharing app, USM Business Systems is the best mobile app development company to ensure a high-quality solution.