Paranoid Android provides a unique experience and ultimate customization for your Android device.



LineageOS is described as 'Free and open-source Android-based OS for smartphones and tablets that enables deep customization, regular security updates, privacy focus, and broad device compatibility' and is a very popular Mobile OS in the security & privacy category. There are more than 25 alternatives to LineageOS for a variety of platforms, including Android, Linux, Android Tablet, Linux Mobile and iPhone apps. The best LineageOS alternative is GrapheneOS, which is both free and Open Source. Other great apps like LineageOS are Android, iodéOS, /e/ and Ubuntu Touch.
Paranoid Android provides a unique experience and ultimate customization for your Android device.



Sailfish OS is a European alternative to dominating mobile operating systems, and the only mobile OS offering an exclusive licensing model for local implementations.




Sailfish OS is the most popular commercial alternative to LineageOS.
An operating system that respects your rights to privacy, security, and freedom, by design.


alternative, open source version of Fairphone OS, built by Fairphone, that puts transparency and ownership in the spotlight.
Project Elixir basically offers a minimal UI enhancement & close to Stock Android ROM with great performance, security and stability. Your experience while using Project Elixir will be butter smooth without compromising the quality of the Android experience.


iOS is a mobile operating system designed by Apple for its iPhone and iPad devices. It offers a user-friendly interface, intuitive features, and seamless integration with other Apple products. With iOS, you can access a wide range of apps, games, and multimedia content, as well...

LineageOS is open, open source, and private; iOS is very closed and proprietary.

This alternative is disputed. iOS is a legitimate LineageOS alternative, but it might have issues that some users think are important.
iOS is the most popular iPhone alternative to LineageOS.



Open source Linux-based platform designed for smartphones, tablets, netbooks, automotive infotainment, and smart TVs, offering scalable compatibility, advanced multimedia, touch support, Application Compatibility Layer for Android apps, 3D UI, and multitasking.



Distributed microkernel OS with AI and edge computing capabilities for smartphones, wearables, TVs, tablets, and IoT; features multi-layered architecture, custom device kernels, Linux ABI compatibility, seamless interaction, and resource sharing across devices.

CarbonRom is an aftermarket firmware based on the Android Open Source Project.
Features:
PIE Halo AOKP Ribbons Comprehensive speed enhancements, including Linaro -O3 and processor-specific optimizations Unofficial Voodoo Sound support on Note 2 and i9300 de.



It supports Sony Xperia Z3 Compact

Ubuntu Touch is made and maintained by UBports. It is a free and open source mobile OS for you! Meanwhile we care about your privacy and freedom.
Evolution X is a flashable Custom ROM to bring a true Pixel feel to your Android Device at first glance, with many additional configurations at your disposal. We aim to provide frequent builds with monthly security patches from the latest aosp sources.


iOS only runs on Apple hardware