Sailfish OS is described as 'Mobile-optimized with the flexibility, ubiquity and stability of the Linux core and a cutting edge user experience built with the renowned Qt™ platform' and is a popular app in the OS & Utilities category. There are more than 25 alternatives to Sailfish OS for a variety of platforms, including Android, Linux, Android Tablet, iPhone and Self-Hosted solutions. The best alternative is Android, which is both free and Open Source. Other great apps like Sailfish OS are LineageOS (Free, Open Source), Ubuntu Touch (Free, Open Source), /e/ (Free, Open Source) and GrapheneOS (Free, Open Source).
A free and open-source operating system for smartphones and tablet computers, based on the Android mobile platform. It is the successor to the highly popular custom ROM CyanogenMod, from which it was forked in December 2016 when Cyanogen Inc.
Ubuntu Touch is a mobile version of the Ubuntu operating system for mobile devices. It is adapted to run naturally in a mobile, touch-screen environment but is also capable of functioning as a desktop computer while in "desktop mode".
/e/ is a fork of LineageOS that aims to be completely free of everything Google. Not only that, but there are a number of goals the developer has in mind for /e/ that more people feel are vital to a mobile operating system.
iOS is a mobile operating system developed by Apple Inc. and distributed exclusively for Apple hardware. It is the operating system that powers iPhone, iPad and iPod Touch. Each main version of iOS / iPhone OS has introduced a big, main feature of the new version.
postmarketOS (pmOS), is a touch-optimized, pre-configured Alpine Linux that can be installed on smartphones and other mobile devices. The project is at very early stages of development and is not usable for most users yet. We develop a sustainable mobile OS