Omarchy OS: Can I use Flatpak apps in Omarchy?
Yes, after installing Flatpak and configuring a Flatpak repository such as Flathub.
Omarchy’s documented Install menu focuses on Arch packages and the AUR. Flatpak is a separate package system: install its Arch package, add a repository, then use flatpak install for apps. Follow Flatpak’s setup instructions for current commands.
Source: Omarchy manual.