Private Eye is a free network monitor for Mac
When an app makes a network connection, you see it instantly on your screen. There's no delay and you don't have to use a separate recording mode.
Interested in the connections of a single app? Only outgoing traffic? You can filter the list of connections to avoid being overwhelmed by noise.
Close the app window, and the network monitor is automatically turned off. Private Eye stays out of the way by slacking off whenever you aren't looking.