blendOS is an immutable operating system. This means your filesystem is read-only, thus resulting in stable experience. It's based on Arch Linux, but you can use any app from any of the distros supported by blendOS, or even install a desktop environment from any of the distros and use the distros in standalone sessions. GNOME is the officially supported desktop environment, but you can also choose other desktop environments such as KDE Plasma and XFCE at the time of installation.