The easiest network monitor and firewall for Mac
Radio Silence can stop any app from making network connections

Powerful privacy for your Mac

Radio Silence lets you keep a list of apps that aren't allowed to go online.
Protect your privacy
Prevent apps from phoning home
Save on bandwidth and data charges
Radio Silence is completely invisible

The firewall is invisible and always active. You don't have to keep any windows open.
No annoying pop-ups
No clutter on your screen or dock
No effect on your Mac's performance