Review on Little Snitch by Douglas Cochrane

The best feature is being able see what programs are sending data over my network without having them installed (or even knowing about it). I used LittlSniht for years but never realized how much information was sent by apps that were not open at any given time until recently when Apple started requiring more privacy from its own products. This has been really great since we got our MacBook Pro's last year with Touch Bar - no need to click through menus anymore just be aware if an app/website wants access to everything going across Wifi & Cellular Networks now.