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GrapheneOS is more simple and vanilla than CalyxOS. GrapheneOS puts substantial effort into seamless/passive privacy and security features, as well as maintaining feature parity with the Android Open Source Project and with Googles stock Pixel operating system.

CalyxOS is not a private or secure operating system. They have added several 3rd party apps and services, which includes several 3rd party connections. On top of this, several of these services are given problematic, privileged access.

A notable example of this is Android Auto. CalyxOS grants substantial privileged access to this component by default, while GrapheneOS sandboxes it, and exposes 4 opt-in toggles for privileged access. The user may granularly decide what privileged access they wish to grant.