Apps phoning home?
Not on your watch.

Radio Silence is a tiny firewall that lets you block any application from accessing the internet.

It is designed for people who are not interested in configuring traditional firewalls. Radio Silence supports OS X Yosemite, Mavericks, Mountain Lion, Lion, and Snow Leopard. It only takes a few seconds to install.

Buy now for only $9  $15 
You save 40 %
Download (Includes free 24-hour trial)

Radio Silence has a risk-free 30-day guarantee. If you're not absolutely happy, you'll get your money back, no questions asked.

The Radio Silence firewall blocks outgoing connections

What makes Radio Silence a great firewall?

100% Annoyance-free

Radio Silence respects your concentration. That is why it will never interrupt you with pop-up windows or alerts.

Zero Maintenance

Once the firewall is installed, you can forget all about it. It is always on and needs no attention from you.

Tiny and Fast

Radio Silence weighs next to nothing. It doesn't waste any time or resources, which also makes it blazingly fast.

Usable by Anyone

You don't have to be a network expert to use this firewall. It takes care of all the technical details for you.

A firewall that people actually like?


“A lot of apps secretly check in with the mothership behind the scenes without asking your permission. If you'd prefer they didn't, Radio Silence can solve your problem hassle-free.”

Macworld gave Radio Silence 4 out of 5 mice It is perhaps the easiest firewall I’ve ever used.

LogicielMac gave Radio Silence 4.5 stars Editor's rating LogicielMac gave Radio Silence 4.5 stars Average user rating

Love For Tech

“A hassle-free, and cheaper, alternative to its cousin Little Snitch.”

"Awesome app."
"I just bought Radio Silence and love it!"
"It does exactly what I was looking for! Thank you again for a fantastic product!"
"A really nice app!"
"I love your app Radio Silence. It's great in the same way Apple-made apps are great: fantastic minimalism, great interface, no-nonsense."
"Your software is awesome!"
"WOW... you guys ROCK!"
"I've been using Radio Silence for a while now and wanted to say thanks. It's cool!"
"Great app, thanks!"
"I'm very sorry for the trouble, but I would like to take you up on the 30 day refund policy. I think Radio Silence is a very nice app, it's just not what I needed right now." (Full refund sent within two hours, no hard feelings!)