The best Android ROM alternative to CalyxOS is GrapheneOS, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 25 alternatives to CalyxOS and many of them are Android ROMs so hopefully you can find a suitable replacement. Other interesting Android ROM alternatives to CalyxOS are LineageOS, iodéOS, /e/ and postmarketOS.
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...
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.
alternative, open source version of Fairphone OS, built by Fairphone, that puts transparency and ownership in the spotlight.
Paranoid Android provides a unique experience and ultimate customization for your Android device.
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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.