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
Windows Phone offers a user-friendly interface and strong integration with Microsoft services, but lacks a robust app ecosystem due to discontinued support. Sailfish OS, being open-source, emphasizes privacy and customization but struggles with hardware support and mainstream app availability.