It has some privacy features on top of AOSP, such as the [Datura firewall](https://calyxos.org/docs/tech/datura-details), [Signal](https://signal.org) integration in the dialer app, and a built in panic button. CalyxOS also comes with firmware updates and signed builds, so [verified boot](https://source.android.com/security/verifiedboot) is fully supported.
To accomodate users who need Google Play Services, CalyxOS optionally includes [MicroG](https://microg.org/). With MicroG, CalyxOS also bundles in the [Mozilla](https://location.services.mozilla.com/) and [DejaVu](https://github.com/n76/DejaVu) location services.
Currently, CalyxOS [supports](https://calyxos.org/docs/guide/device-support/) Google Pixel phones and the Xiaomi Mi A2. For legacy devices, CalyxOS offers "extended support" for much longer than GrapheneOS, making it a good choice once GrapheneOS has dropped support.
CalyxOS's "extended support" does not have full security patches due to the original equipment manufacturer (OEM) discontinuing support, therefore they cannot be considered completely secure.
With the Xiaomi Mi A2, CalyxOS does not distribute the latest firmware. Newer versions of the firmware prevented the device from performing verified boot.
The Datura firewall can leak in some circumstances (see [#572](https://gitlab.com/CalyxOS/calyxos/-/issues/572) and [#581](https://gitlab.com/CalyxOS/calyxos/-/issues/581)).
