Little Snitch
See and control every connection your Mac makes
About Little Snitch
Little Snitch watches every outbound connection your Mac makes and asks before anything phones home. After a week of alerts you'll be startled by how chatty your apps really are.
It's the definitive Mac firewall — version 6 supports macOS Tahoe, and the network monitor's live traffic map is genuinely useful rather than eye candy.
At $59 one-time it isn't cheap, but there's a free demo mode, and for anyone serious about knowing what leaves their machine it's the obvious pick.
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