Little Snitch
Little Snitch
4.4.3

4.2

Little Snitch free download for Mac

Little Snitch

4.4.3
08 October 2019

Alerts you about outgoing network connections.

Overview

Little Snitch gives you control over your private outgoing data.

Track background activity
As soon as your computer connects to the Internet, applications often have permission to send any information wherever they need to. Little Snitch takes note of this activity and allows you to decide for yourself what happens with this data.

Control your network
Choose to allow or deny connections, or define a rule how to handle similar, future connection attempts. Little Snitch runs inconspicuously in the background and it can even detect network-related activity of viruses, trojans, and other malware.

What's new in Little Snitch

Version 4.4.3:

macOS Catalina Note: Please upgrade to this version before you upgrade to macOS Catalina!

  • On Catalina, system apps have been moved from /Applications to /System/Applications and the paths in rules must be updated. If you upgrade to Catalina while a previous version of Little Snitch is installed, rules for system apps are not updated.
macOS Catalina compatibility
  • Some of the system apps previously found in /Applications have moved to /System/Applications. This version updates your Little Snitch rules accordingly.
  • The animation that’s shown when turning on the “Keep above other windows” option in Network Monitor has been changed so that it no longer requires to record the computer’s screen (which caused a privacy warning on macOS Catalina).
  • It’s now possible to restore backups that are located in a privacy protected folder such as Documents, Desktop or Downloads on macOS Catalina.
Improvements
  • Little Snitch warns about potential consequences when you deny a connection and Little Snitch knows the purpose of the connection. Since this warning may be annoying, it can now be disabled on a per-application basis.
  • Added support for additional remote endpoint types in the Internet Access Policy. The IAP can now contain information about Berkeley Packet Filter access and connections to the local network.
  • It’s now possible to simply delete “Code Signature Issue Override Rules” in Little Snitch Configuration. Fixing the underlying issue is still possible in the context menu or by double-clicking the rule.
  • Various user interface fixes and improvements.
Bug Fixes
  • Fixed: Clicking a column header in the rules list in Little Snitch Configuration didn’t sort the list.
  • Fixed a rare kernel panic which could occur when the system runs out of memory.

653 Little Snitch Reviews

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Rate this app:

Derekcurrie
27 September 2012

Most helpful

The Best 'Reverse Firewall' Available. Now 64-bit Enabled. Pros Little Snitch continues to be the best 'reverse firewall' available. This major upgrade also adds further refinement and control to all out-going Internet calls. It is well worth the $16.95 upgrade price. Cons NOT for newbies. The complexity of understanding and controlling out-going Internet calls by browsers and apps these days has reached the point of being often incomprehensible. It requires research to know exactly what is going on. Power users may well find themselves devoting more time than they like keeping up with WHOIS-ing the obscure addresses and ports being called these days. This is no fault of Little Snitch. I wish Little Snitch had a quick and easy WHOIS service built into each message box. Little Snitch looks up the names of sites being called via reverse DNS. But that's no longer good enough when there is no name associated with an IP address. I want the details quickly at hand. Summary Little Snitch is now 64-bit, like nearly all of OS X at this point. This version refines control of out-going calls over the Internet. The $16.95 upgrade price is nice. It is well worth buying for any geek level Mac user. I appreciate all the new details that have been added in this version. The developer has put a lot of time into pushing Little Snitch even further in functionality. The interface of Little Snitch Configuration has become much more complex. Getting used to it will take patience, but provides fairly swift comprehension if you're already used to Little Snitch. Newbies will be overwhelmed, not question about it. Dive in, learn one thing at a time, gradually get the hang of it. Do NOT give up and turn on automatic approval! Keep working on it as this is a valuable tool for many reasons. I want a full WHOIS service built into every Little Snitch popup box. The app will use reverse-DNS to look up the names of IP services, but frequently there is no server name available. So give me MORE information about the IP address! I want to know who owns the IP address. That can tell me all I need to know. If there really is no data on an IP address, I want to know that as well. I do NOT want to have to keep running a 3rd party WHOIS all the time on obscure IP addresses! It would be entirely easy to add a WHOIS button into the Little Snitch boxes that trigger the WHOIS service built into OS X already. If we've already got a highly complex reverse firewall, which we do in Little Snitch v3.0, then lets get the essential bells and whistles up front and available as well. It is entirely pointless trying to make Little Snitch into an easy basic user application. So let's geek it out to the max if the further details are critical. For me, WHOIS for obscure IP addresses is critical. One nice feature that appeared immediately when I first ran the upgrade was a notice about redundant settings. You get little Caution symbols listed for the stuff that can be potentially removed, and little diamond symbols for the more general rules that encompass the detailed redundant rules. I don't know where the redundancy came from, but expect it was due to Little Snitch itself adding the basic rules. That's fine. I went through the long list, made sure all the basic rules made sense of each app (which often requires looking up the service and understanding what it does) and tossed out all the redundant rules that were not needed. The result is a nice cleaning. The big whopping danger with all the complexity of controlling out-going calls is missing that one service you don't recognize, or may be using a copy-cat name, and approving it to call out. There is no doubt that we are going to be 'social engineered' at some point, after an infection has already occurred, to approve a bad service. Therefore, vigilance is required. This is the sort of stuff that goes right over Granny's head. She'll end up auto-approving everything just to shut up Little Snitch. Therefore, this is Geek software, and very nice Geek software. I suspect that with time and need there will be more easily accessible white and black lists on the net to assist reverse firewalls know what to do without consulting the user every little time. But until then, Little Snitch remains a confusing hassle to anyone who doesn't know what they're doing with it and who doesn't actually WANT its full functionality. I continue to enjoy having Little Snitch and appreciate the developer's work on it. I look forward to other people's reviews and insights. [For those concerned: Little Snitch v3.0 is 'Universal' in that it will now run as 64-bit on 64-bit capable Macs. Using Get Info you can switch it to 32-bit mode if you choose. It will automatically run as 32-bit on 32-bit hardware.]
Like (18)
Version 3.0
Dhess01
08 October 2019
Um, yeah. If you installed this after the Catalina upgrade, here is the terminal fix: When you install Little Snitch on macOS Catalina, you may get an error message “Little Snitch version mismatch detected” after restarting your Mac. This is due to a bug in macOS Catalina, sometimes failing to update the boot cache for the newly installed kernel extension. If you are experiencing this problem, please perform the following steps: Restart your system in macOS Recovery. Learn more If you have enabled FileVault to encrypt the contents of your system volume, you first have to mount that volume: Open “Disk Utility”, select your system volume in the sidebar and click the “Mount” button in the toolbar. Please be patient – mounting FileVault volumes may take quite a while. Once the volume is mounted, quit the “Disk Utility” application. Open Terminal from the Utilities menu in the menu bar. Enter the following command: touch "/Volumes//System/Library/Extensions" Note: Replace with the actual name of the volume on which macOS Catalina is installed (usually “Macintosh HD”) Wait about 10 seconds. Then choose “Restart” from the Apple menu in the menu bar to restart your computer. Shutting down can take up to a few minutes because the system is rebuilding the boot cache in the background. Note that during this time no progress indication is shown.
Like (1)
Version 4.4.3
Macguruguy
20 July 2019
No longer installs properly in Mojave. Says extension is blocked by system, but when unlocking prefs to allow installation, developer is not shown as an option. Contacted developer, but they did not provide a resolution to the problem. Has existed in last 2 versions.
Like
Version 4.4.2
1 answer(s)
Derekcurrie
Derekcurrie
22 July 2019
I'd write the developer again. Keep in mind that this is summertime in the USA and vacation behavior is to be expected. Meanwhile, you should see this:

• GoTo: Menu/SystemPreferences/Security & Privacy/Privacy/
• Be sure "Enable Location Services" is checked ON.
• In the list you should see "Little Snitch Helper". It too should be checked ON.
• Also, when installing or updating Little Snitch, several extensions are installed into the system. Be sure something else installed in your system isn't blocking them.

The usual routine in these matters is to UNinstall the app entirely, then REinstall. I have the latest Little Snitch running perfectly on my MBP with Mojave.
Like
RogerKatz
16 July 2019
The current version is 4.4.2
Like (2)
Version 4.4
Hal-Itosis
16 July 2019
Actually, this isn't version “4.4.1” —rather, it’s still version 4.4 (build 5405) from July 4th 2019.
Like (1)
Version 4.4.1
Fariborz
02 July 2019
Rock-solid and bomb-proof!! Words cease to express its utility!
Like (3)
Version 4.4
LeMerlot
09 May 2019
Yeah, finally they even fixed the boring CPU issue (LS's CPU usage went up to 15% CPU while just moving my USB mouse a bit). Now I'm in love with LS again… :D
Like (2)
Version 4.3.2
frans-3
08 March 2019
Is it me? Is my Mac MUCH slower since installing version 4.3?
Like (3)
Version 4.3.1
1 answer(s)
frans-3
frans-3
09 March 2019
Uninstalled it and the Mac is back to its old speed. Something in LS is slowing things down since v 4.3... :-(
Like (1)
Panocha
08 March 2019
I would give it a 5 star if it was just for the app, but the company has a terrible price gouging forced upgrade policy. I don't care about the maps and other crap, I just want a good application firewall. I tried Hands Off to avoid these prices, but their crap kernel Panics constantly. LS need to make a lite version without all the maps and junk. They force you to upgrade because the older version no longer works after an OS update. So, the app gets 5 stars, but the company gets zero for price gouging. If there was another working solution out there, I would use it.
Like (8)
Version 4.3.1
Dualist
12 February 2019
As reported by Ars Technica, be very wary of Little Snitch (And Adobe Flash) installers: some apparently legitimage installers are bundled with Windows executables that are enabled to run on MacOS and bypass Gatekeeper, infecting your Mac with malware. https://bit.ly/2GIb55E
Like
Version 4.2.4
2 answer(s)
AnthoLogical
AnthoLogical
06 March 2019
@Dualist you forgot to say that those apparently legit installers are distributed illegally with torrent files on warez websites, as stated by Ars Technica: << ... after analyzing an app available on a Torrent site that promised to install Little Snitch. >>
Like (4)
Derekcurrie
Derekcurrie
08 March 2019
WAREZ (cracked & torrented) versions of Mac OS apps have contained Trojan horse malware installers since 2009 when pirated versions of Apple's iWork and Adobe Photoshop were infested with the iServices bot malware. Tens of thousands of Macs were infected. Even source developer websites have been hacked and infested versions of their apps substituted. One example was the Transmission app.
-> IOW: It pays to be cautious, even on Macs.
Like (3)
Johnnyr
26 November 2018
Love Little Snitch and have been using it for years. After updating to Mojave the cold boot takes foever. Some users seems to think it has something to do with Little Snitch. I hope the LS developer will find a fix because it's really annoying!
Like (1)
Version 4.2.3
1 answer(s)
Derekcurrie
Derekcurrie
12 December 2018
v4.2.4: "Fixed an issue that could cause a delay during system startup on macOS Mojave under some circumstances"

I was bitten by this as well. I can verify that the longgggggg boot has ended and sanity has been restored. Hurrah.
Like (2)
$50.45

4.2

App requirements: 
  • Intel 64
  • OS X 10.11.0 or later
Category: 
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