Currently Guardian Firewall is only available on iOS and iPad. iPad's user interface is currently not optimized but Guardian Firewall functions properly on iPad. Official iPad support is in the pipeline and coming soon. Our founders are experts in iOS, and so this was development step one, but you can rest assured we are in the process of expanding our platform support.
With increasing interest in using one security application across multiple devices and platforms, we are exploring a roadmap of development that would include many platforms including MacOS and Android for users to protect their information across all of their devices. Official announcements can be found on our Twitter account @guardianiosapp.