Sailfish OS is a general purpose Linux used commonly as mobile operating system combining the Linux kernel for a particular hardware platform use, the open-source Mer core stack of middleware, a proprietary UI contributed by Jolla or an open source UI, and other third-party components. Developed by Jolla
License: Open Source
OxygenOS is designed for performance and a smooth user experience with a wide app ecosystem, primarily for OnePlus devices. In contrast, Sailfish OS focuses on privacy, open-source principles, and multitasking, making it suitable for users who prioritize security and customization.