[darklajid]

https://www.wireguard.com/xplatform/

There exist closed source third party clients for Windows/OS X, and wireguard itself has currently two (unreleased) reference libraries in Go and Rust to support future cross-platform clients.

So the answer to "how portable" is probably "portable" :-) (I don't know if there are any plans for _kernel_ mode implementations for anything but Linux, but cross-platform user mode clients are part of the project's goals)

[feelin_googley]

Thank you. It sounds like portability may come via a userspace program. I look forward to it.