The best Operating System alternative to GrapheneOS is Android, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 25 alternatives to GrapheneOS and many of them are Operating Systems so hopefully you can find a suitable replacement. Other interesting Operating System alternatives to GrapheneOS are LineageOS, CalyxOS, postmarketOS and Ubuntu Touch.
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.
United States
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.
United States
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".
United States
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.
Switzerland
Ubuntu Touch is the Ubuntu operating system for mobile phones originally created by Canonical and now developed by the UBports Community.
Germany
EU
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...
United States
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.
GermanyEU
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.
FranceEU
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...
United States
Sailfish OS is a European alternative to dominating mobile operating systems, and the only mobile OS offering an exclusive licensing model for local implementations.
FinlandEU
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.
India
Mobian is an open-source project aimed at bringing Debian GNU/Linux to mobile devices.
