If you’ve ever wondered precisely what your Mac is connecting to on the internet and when it’s doing it, there’s a new free app called Private Eye to help you out.
Private Eye is a simpler option, but still a useful one. All it does is show you what’s going on, network-wise.
As applications on your Mac make outgoing internet connections, or pick up incoming ones, this activity is picked up and shows in Private Eye’s list.
You can sort by by application or by incoming/outgoing connections. The chances are for most people that the incoming ones will be rare, but that makes them all the more worth knowing about.
Private Eye is strictly a viewer app: it collects the information and displays it, but nothing more. You can’t do anything from inside Private Eye. If you see an app misbehaving or making a connection you’d rather it didn’t, you’ll have to intercept it or deactivate it elsewhere.
Source: Radio Silence