On MacOS you can use Little Snitch [1] to do exactly this. You can watch all network connections per app, even grab a pcap of traffic just for the app as well.

On MacOS you can use Little Snitch [1] to do exactly this. You can watch all network connections per app, even grab a pcap of traffic just for the app as well. You can setup restrictions to block incoming and outgoing traffic. It basically is a per-app firewall. [1] https://www.obdev.at/products/littlesnitch/index.html https://www.obdev.at/products/littlesnitch/index.html