In short, Little Snitch is a comprehensive traffic analysis and firewall solution that's been in development for 10 years and for $34.95 it's worth every penny. Little Snitch also does a lot more as well including analyzing rulesets to eliminate redundant and conflicting rules and it can suggest rules based on previous network usage. Profiles can also be selected automatically by Little Snitch based on IP address.Ī feature of Little Snitch I particularly like is the "Research Assistant" which provides guidance in identifying what processes actually are (many OS X processes have obscure and unfathomable names) and what they do. Rules can be grouped into "profiles" allowing you to have different rule sets for different environments such as home, office, and, for example, Starbucks. There's also a realtime monitor you can run to keep track of network activity. In silent mode you can log all connections then retrospectively define permanent rules to control how processes access the network. You can run Little Snitch in interactive mode permitting and denying connection on a session basis or forever for process connections ranging from any port on any server to a specific port on specific server. Little Snitch 3 is compatible with OS X 10.9, 10.8, 10.7 and 10.6.8 and provides detailed firewalling and reporting on processes, outgoing connections, remote end points, incoming connections, ports, and protocols along with detailed traffic histories from the last hour down to one minute resolution, filtering and sorting of connections, statistics, traffic capture and snapshots, and correlation of system events (this allows you to tie, for example, app launch and termination to specific network activity).
The tool is called Little Snitch 3 published by Objective Development.
OS X, on the other hand, has traditionally had a much smaller range of tools available but I have a professional-grade OS X utility that not only does the job extremely well but is also priced right. On Windows there is a pretty wide range of choices.
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