The best open source alternative to Android is LineageOS. If that doesn't suit you, our users have ranked more than 25 alternatives to Android and many of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Android are Ubuntu Touch, GrapheneOS, /e/ and postmarketOS.
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.
Ubuntu Touch is the Ubuntu operating system for mobile phones originally created by Canonical and now developed by the UBports Community.
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...
/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.
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.
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".
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.
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...
This is a project to port Android open source project to x86 platform, formerly known as "patch hosting for Android x86 support". The original plan is to host different patches for Android x86 support from open source community.
Paranoid Android provides a unique experience and ultimate customization for your Android device.
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Lineage is basically stock Android without bloat from Google or device manufacturers. You can usually update to a more modern version of Android than your device natively supports, and you can reinstall any software you still want, so it's a great alternative.