CalyxOS is described as 'Everyone needs a phone. Not everyone wants governments and corporations tracking their every move and spying on their communications. CalyxOS lets you have your cake and eat it too, with "Privacy by Design"' and is a popular Mobile OS in the os & utilities category. There are more than 25 alternatives to CalyxOS for a variety of platforms, including Android, Android Tablet, Linux, Linux Mobile and Android SDK apps. The best CalyxOS alternative is GrapheneOS, which is both free and Open Source. Other great apps like CalyxOS are Android, LineageOS, iodéOS and /e/.
GrapheneOS is a privacy and security focused mobile OS with Android app compatibility developed as a non-profit open source project. It's focused on the research and development of privacy and security technology including substantial improvements to sandboxing, exploit...
Open-source mobile OS developed by Google, based on the Linux kernel. It supports app development in Java and Kotlin. Compatible with various devices, offering seamless integration with Google services, customizable interface, and extensive app ecosystem for smartphones and tablets.
Free and open-source Android-based operating system for smartphones and tablets, designed to enable deep customization, enhanced privacy controls, regular security updates, and broad device compatibility without default proprietary Google services.
Android-based OS emphasizing privacy, open source transparency, tracker and ad blocking, independent app installation, digital sovereignty, community development, routine updates, environmental sustainability, and a familiar interface for alternative Android devices.
/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.
postmarketOS extends the free and open source operating system Alpine Linux to run on smartphones and other mobile devices. Alpine is a security-oriented, light-weight Linux distribution based on musl libc and BusyBox.
Ubuntu Touch is the Ubuntu operating system for mobile phones originally created by Canonical and now developed by the UBports Community.
Replicant is a fully free Android distribution running on several devices, a free software mobile operating system putting the emphasis on freedom and privacy/security. It is based on LineageOS and replaces or avoids every proprietary component of the system, such as user-space...
Plasma Mobile turns your phone into a fully open hacking device, just like a PC. You can join us to start building new mobile experiences now.
PixelOS is an AOSP based ROM, with Google apps included and all Pixel goodies. We aim to provide an experience similar to Google Pixel phones with numerous performance enhancements and a small amount of useful additional features.
Mobian is an open-source project aimed at bringing Debian GNU/Linux to mobile devices.
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Not only is GrapheneOS way ahead of other mobile operating systems in terms of security, it also works better. This may be largely due to the sandboxed Google Play services, providing both privacy and functionality lacking from many alternatives. Installation via the command line was simple. All the instructions worked first time and took less than 30 minutes.