Little Snitch is a lightweight app for Apple OS that monitors your computer and network for programs that may be leaking sensitive information out into the internet. Firewalls are built to keep viruses and malware off your computer, but they don't monitor programs that are sending information off your computer. Little Snitch offers a host of graphs, alerts and rules that you can configure to tell you when a program or service on your computer is trying to communicate your information out to the internet. Keep your important data safe, with Little Snitch.