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TCPBlock is a lightweight and fast application firewall for OS X 10.6 or later developed by Jo Delantis. The OS X firewall protects you from connections that come from outside of your computer. But what about the software from your computer that opens new connections to the internet? With TCPBlock you can prevent selected applications on your computer from opening connections to the network.

TCPBlock is implemented as a loadable kernel module which contains all the blocking logic. You can configure it in the System Preferences TCPBlock preference pane or with the tcpblock command line utility. All the configuration more...

What's New

Version 4.2:
  • Solved an error related to connecting apps display.


  • OS X 10.6 or later

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5 31


Current Version (4.x)


Downloads 66,252
Version Downloads 36,821
License Free
Date 26 Apr 2014
Platform Intel 64 / OS X / Intel 32
Price Free
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