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
Tizen is an operating system based on the Linux kernel and the GNU C Library implementing the Linux API. It works on a wide range of devices, including smartphones, tablets, in-vehicle infotainment devices, smart TVs, PCs, smart cameras, wearable computing (smartwatches), Blu-ray players, printers and smart home appliances. Developed by Linux Foundation
License: Open Source
Tizen OS is primarily designed for Samsung devices and offers broad compatibility, especially in smart TVs and wearables, but has a limited app ecosystem. Sailfish OS, on the other hand, is an open-source platform that emphasizes privacy and supports Android apps, but it has less hardware support and visibility.