It's not exclusive to NixOS, but I've only packaged it for NixOS.
The UI looks like shit, but it allows showing all the configs in /etc/wireguard and toggling them on or off with wg-quick.
The biggest issue I had was with slint. I can't make sense of it (yet).
This was written because after getting a windscribe subscription, I found out that the app doesn't work on #NixOS and the pull request to add it 1) doesn't work, 2) is being nitpicked to death.
Yeah, that's not what I'm looking for. Windscribe has 200+ VPN locations. I'd have to manually import every single one. Sure, probably would take less time than it took writing this, but if they update a few configs (or everything at once for some reason), I'd have to go through the hassle of removing the existing configs and updating each one manually again.
If it had a batch importer or even just supported configs in /etc/wireguard (or a custom directory), that would also be great. But from what I understand, it's a frontend for NetworkManager, which uses a different configuration format for connections .nmconnection and is terribly documented.