It can be used for any OS. It's a network level blocking solution which blocks domains at the DNS level. You can build one on a Raspberry Pi or Linux on a physical box or in a virtual machine. You can add curated block lists and add your own, white list, black list domains and so forth. I am blocking over 3.3 million domains and I block all domains that are Facebook properties.Yea, I'd like to know more about this. Can I use it for macOS and iOS?