飞牛私有云 (fnOS) is a free, efficient, and secure NAS system designed for iPhone users. This application facilitates easy access, management, and utilization of private storage data and applications. Developed by a professional team focusing on stability and seamless updates, it ensures a user-friendly interface and high storage efficiency for mobile users.

The application offers compatibility with mainstream x86 hardware, making it suitable for repurposing old devices. Key features include high-performance file aggregation, a powerful media player with automatic poster and subtitle matching, multi-user file management, and backup support for various cloud services. With comprehensive resource monitoring and system management capabilities, 飞牛私有云 provides users full control over their NAS operations.