When comparing One Periodic' s Hands Off vs Radio Silence, the Slant community recommends Radio Silence for most people. In the question“What is the best OS X firewall?” Radio Silence is ranked 1st while One Periodic' s Hands Off is ranked 4th. The most important reason people chose Radio Silence is:
This app, like Little Snitch, selectively blocks outgoing connections, but it has a more detailed network monitor. Get this if you want an easier to use and more affordable firewall than Little Snitch.
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Pros
Pro It lets you control application's disk writing permissions as well
Besides giving you control over what applications in your computer can access the internet, it also lets you select which ones are allowed to write to your disk, so if you're very paranoid about data leaking, this app is for you.
Pro Prevents applications from phoning home
It can block both incoming and outgoing connections.
Pro User friendly interface
It resolves DNS queries, so instead of popping up with a generic question like "I wan to to connect to 17.173.255.222 on UDP port 16384", a more informative popup will tell you "I want to connect to talk.google.com".
Pro Cheaper and easier to use than Little Snitch
This app, like Little Snitch, selectively blocks outgoing connections, but it has a more detailed network monitor. Get this if you want an easier to use and more affordable firewall than Little Snitch.
Pro Normal system processes don't produce popups
It has internal filters for normal operating system process, so they don't produce popups, preventing the firewall from nagging you excessively. This feature can also be turned off.
Pro Tiny footprint
This app is tiny and fast. It won't annoy you with tons of popups, neither will slow your system down, not even on older Macs.
Cons
Con Expensive
It's expensive when compared to other firewall software out there.
Con It is not well suited for security conscious professionals
The lack of expert configuration options leave us with only the most basic protection.
Con It defaults to allow all connections
Unless you specifically add an application to the blacklist, it will be allowed by default, making the firewall easier to use to the novice, but also letting you potentially leak valuable data by a rogue app.