This release contains changes in the following areas:
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Sep 02, 2019.
Improved detection of program modification
Little Snitch has a security mechanism that ensures rules are only applied to programs for which they were originally created. This is to prevent malware from hijacking existing rules for legitimate programs. To do that, Little Snitch must be able to detect whether a program was modified. How Little Snitch does that changes with this version.
Previous versions required a program to have a valid code signature in order to be able to detect illegitimate modifications later on. Programs without a code signature could not be validated and Little Snitch warned accordingly. The focus was therefore on a program’s code signature.
Beginning with version 4.3, Little Snitch can always check whether a program has been tampered with, even if it’s not code signed at all. The focus is now on checking for modifications with the best means available. That is usually still the code signature but for programs that are not code signed, Little Snitch now computes a secure hash over the program’s executable. (There’s still a warning if a process is not signed, but only to inform you about a possible anomaly.)
This change leads to a different terminology. When editing a rule, Little Snitch Configuration no longer shows a checkbox titled “requires valid code signature” but instead one that is titled “check process identity” (or if the rule is for any process: “apply to trusted processes only”).
Instead of a “code signature mismatch”, Little Snitch’s connection alert now informs that “the program has been modified”.
In cases where Little Snitch detects such a modification, it now also better explains the possible underlying cause and the potential consequences.
For more information see the chapter Code identity checks in the online help.
Configuration File Compatibility
This version uses a new format with speed and size improvements for the configuration file in which the current rule set and the preferences are stored. This new file format is not compatible with older versions of Little Snitch, though.When updating to Little Snitch 4.3, the old configuration file is left untouched in case you want to downgrade to a previous version of Little Snitch. All changes made in Little Snitch 4.3 or later are not included in the old file, of course.Note that backup files created using File > Create Backup… in Little Snitch Configuration use the old file format and are therefore backward-compatible with previous versions of Little Snitch.
Improved Support for macOS Mojave
- Improved appearance in Dark Mode.
- Fixed backup restore from Time Machine not working in Little Snitch Configuration due to the new “Full Disk Access” security mechanism.
- Fixed creating Diagnostics Reports for non-admin users (on macOS High Sierra and later). When you contact our tech support, we sometimes ask you to create these reports.
Performance Improvements
- Improved overall performance for large rule sets.
- Reduced CPU load of Little Snitch Daemon during DNS lookups.
- Reduced CPU load of Network Monitor while inactive.
- Improved performance of rule sorting in Little Snitch Configuration, which leads to better overall performance.
- Fixed Little Snitch Daemon hanging while updating a rule group subscription that contains many rules.
- Fixed a memory leak that occurred when closing a snapshot window in Network Monitor.
Internet Access Policy
- Fixed an issue causing an app’s Internet Access Policy not being shown if that app was running in App Translocation.
- Fixed clickable links not working in the “Deny Consequences” popover when creating rules in connection alert or Network Monitor.
- Internet Access Policy file: Fixed large values for a connection’s “Port” being rejected.
Process Identity and Code Signature Check Improvements
- Added support for detecting revoked code signing certificates when checking a process’ code signature. The connection alert and Network Monitor now treat such processes like processes without a valid code signature and show relevant information. Also, rules created will use an appropriate identity check (based on the executable’s checksum, not based on the code signature).
- When showing a connection alert for a process that has no valid code signature, Little Snitch now tries to find out if loading a shared library may have caused the issue with the code signature. If so, this is pointed out in the connection alert.
- Fixed handling of app updates while the app is still running: Previous versions of Little Snitch would complain that the code signature could not be checked if the running app was replaced on disk, e.g. during an update.
- Fixed an issue where connection alerts would erroneously contain a warning that an application’s code signing certificate was unacceptable. This mainly happened when a process’ first connection was an incoming connection.
Improved Handling of Connection Denials and Override Rules
- Improved handling of override deny-rules that were created as a consequence of a suspicious program modification (“Connection Denials”). In Network Monitor, these rules are now marked with a dedicated symbol. Clicking that symbol allows to remove that override rule, if the modification is confirmed to be legitimate.
- Changed override deny-rules created for failed code identity checks to not be editable or deletable. Instead, double-clicking such a rule allows you to fix the underlying issue, which then automatically deletes the override rule.
UI and UX Improvements
- Automatically combine rules: For improved handling of large rule sets with many similar rules that only differ in host or domain names. This is common when subscribing to blocklists, which may contain thousands of similar, individual rules denying connections to various servers. The new “Automatically combine rules” option in Little Snitch Configuration (on by default) now combines such similar rules into a single row, making it much easier to keep track of large lists of rules.
- Improved appearance when Accessibility option 'Increase contrast' is active.
- Improved floating window mode in Network Monitor.
- When choosing File > Restore from Backup in Little Snitch Configuration, the list showing possible backup files now includes backups that Little Snitch created automatically.
- Improved the map shown in the “Known Networks” window in Little Snitch Configuration.
- Improved the legibility of traffic rates in the status menu on Retina displays.
- Fixed data rates shown in Network Monitor to match the values shown in the status menu.
- Fixed the “Duration” setting in Preferences > Alert > Preselected Options not being respected.
- Fixed an issue with “undo” when unsubscribing from a rule group or when deleting a profile.
- Fixed an issue in Little Snitch Configuration where the “Turn into global rule” action did not work.
- Fixed an issue where an error that occurred in the course of a previous rule group subscription update was still displayed, even though the problem no longer existed.
Other Improvements and Bug Fixes
- Increased the maximum number of host names allowed in a rule group subscription to 200.000.
- Fixed an issue causing XPC services inside bundled frameworks to not be recognized as XPC. This resulted in connection alerts to be shown for the XPC services themselves instead of for the app the service belongs to.
- Fixed an issue causing Time Machine backups to Samba servers to stop working under some circumstances.
- Fixed an issue related to VPN connections with Split DNS configuration that caused only the server’s IP address to be displayed instead of its hostname.
- Reduced the snap length in PCAP files, allowing them to be analyzed not only with Wireshark but also with “tcpdump”.
Little Snitch is a popular Mac app that detects outbound connections and lets you set up rules to block those connections. Once installed, Little Snitch monitors your internet traffic and every time it detects an outbound connection, for example, Adobe Reader trying to access the internet, it pops up a window and ask you if you want to allow the connection one time, or make a rule to allow Adobe Reader to access the Internet but just not go to adobe.com
In short, Little Snitch is one of the best apps, to keep an eye on your Mac’s Internet connections. But, do we really need an alternative? Well, for starters, it costs you over $40 and upgrades are extra. This alone can be a reason to look for alternatives that cost nothing or at least relatively cheaper than Little Snitch.
So here are some alternatives to Little Snitch for Windows and macOS. Let’s start with Mac first.
Little Snitch Alternative Catalina Island
Read: The Best WiFi Analyser For Mac
Little Snitch Alternatives for Mac
1. Murus Lite
Mac’s own firewall comes with one of the best features available in network firewalls called the PF (packet filter). However, for some users, it may seem a little complex to use and this is where Murus comes in the picture.
Murus brings the PF feature of a firewall in an intuitive, drag & drop based interface that lets you define your own rule set and control the network permissions on your mac. What makes it different from the existing inbuilt firewall? Well, here’s the catch. Common firewalls like Mac’s own PF, restrict and monitor the inbound and outbound network traffic based on attributes like IP address, ports, protocols etc. and by restricting the network functions itself, it affects all the applications. Murus, on the other hand, helps to use PF feature to convert the network firewall into an application firewall wherein you can allow or restrict movement of data packets for each application individually which even helps in restricting spreading of virus, worms or data leak by an application.
Price: Murus comes in three versions: Murus Lite (Free), Murus Basic ($10), and Murus Pro ($17). While Murus lite is the free version of the application, Murus Basic and Murus Pro are the paid versions that come packed with some extra features like logs Visualizer, Vallum, and all companion apps.
Check it out here: Murus
2. Radio silence
Radio Silence is yet another application to control your app specific firewall functions. It has one of the simplest interfaces which allows you to keep a tab on applications. Softwares that try to connect with a remote server outside the user’s control are blocked instantly. The Firewall has its eye on the incoming traffic, Radio Silence does the opposite and looks for outgoing traffic too.
Little Snitch vs Radio Silence
Initially, Little Snitch gives you too many notifications about connection, which may feel overwhelming to some users. Although, it goes away after few weeks of usage.
Radio silence, on the other hand, is quite silent in the functionality as it runs in the background. without any active tabs, icon display or pop-ups. Once you block an app with Radio Silence, it stays blocked, there is no notification or pop-ups, ever.
Price: Radio Silence costs around $9 and comes with a testing trial of 30 days. You get your money back if it doesn’t meet your expectations. There’s also a 24-hour free trial available for those who want to test this software’s limits in a single stretch.
Check out: Radio Silence
3. Private Eye
Private Eye, a real-time network monitoring application that allows monitoring of your live connections made by an application. The app also indicates the presence of an online server where such information is being transmitted.
It displays all attributes of the live connections that the applications in your system have to the web like the time of connection and the IP address of the server connected to.
Although you can filter and view the results by application or by incoming and outgoing traffic, Private Eye doesn’t have the power to alter any of these connections. You get just enough information to know when an app connects to a server without authorization.
Price: Private Eye is a free application.
Check out: Private Eye
4. Hands off
Hands off is one of the most trusted applications and alternative to Little Snitch when it comes to network privacy. It is also an all-rounder application that gives protection both as the network firewall and application-specific firewall. It controls both inbound and outbound traffic of an application.
Read: See What Others Are Browsing on Your WiFi
Hands off is a little different from other similar applications. It protects and monitors the disk access, and giving an intuitive and user-friendly interface. This app monitors and blocks access to the files stored in your system from online servers and also from the local applications. It prevents the applications from seeking IP address, accessing disk data, erasing disk data, and even storing cookies. Its disk management is so strict that it even controls the read and write permissions of the disk data files even if the applications have access to the files but the interface and usage come in handy.
Price: Hands Off is otherwise an expensive application ($49) but can be tried and tested for free with limited functionality. The advanced functions of the application are accessible in the paid version. The tutorial file that tags along with the application setup is informative.
Check out: Hands Off
5. TCPBlock
TCPBlock is by far the lightest application based firewall available for mac and is absolutely free. It also monitors and protects both inbound and outbound traffic on your mac and can prevent certain applications from opening network connections to unknown servers while you are online.
TCPBlock is implemented as a loadable kernel module which contains all the blocking logic. You can configure it in the System Preferences > TCPBlock preference pane or with the TCPBlock command line utility. All the configuration changes are made in a configuration file on the hard disk of your mac.
Price: Although TCPBlock has discontinued from the market, its previous versions are still available to download for free. It requires only 1.1 MB of your disk space. TCPBlock has the best reviews that an application can get and is still one of the favorites amongst the users. The only catch in using the available version of this application is turning off the SIP (System Integrity Protection). SIP when deactivated, allows third-party applications to run on your mac.
Check out: TCP Block
6. Security Growler
Little Snitch is still hands-down the best connection alerting software available for Mac, we suggest to check it out if you want a comprehensive firewall/alerting system, and are willing to pay a few bucks to get it. Security Growler, on the other hand, is centered around monitoring log files for any kind of pattern. It doesn’t just monitors the TCP connection table but also alerts you of Sudo events, Keychain authorization events, and anything else you can think of that’s reported to a log file.
This app is significantly more lightweight than Little Snitch, it comes in at <15MB of RAM used, simply because it aims to solve a simpler problem than Little Snitch. This application is not designed to prevent malicious connections, that’s what firewalls are for, it’s just meant to keep an unobtrusive log, and alert you whenever important security events are happening. The more informed you are, the better you can protect yourself.
Security Growler is a menu bar based application that sends you notifications whenever one of its monitored patterns have a log update. One thing that sets it apart from other applications, Prowl which sends you notifications over your iPhone and iPad.
Check out: Security Growler
7. LuLu
LuLu by Objective see is another popular opinion amongst Mac users who wish to keep a check on their system’s network activity. The reason for its popularity is because the software is open source, has no ads whatsoever, and comes with all features.
LuLu aims to block all unauthorized outgoing connections unless you specifically allow them. You can choose to allow local or third-party apps and services from the separated menu available. The app interface is pretty simple yet extensive and its operations are so simple that even a child could use it.
When you first install the app you can choose to allow or disallow Apple programmes and previously installed third-party apps. These settings could be later changed from preferences. Under the ‘rules’ head, you can select the services and apps you wish to block from using network services. The app even has a passive mode where it will allow all new apps and still work in silence for the previously installed apps.
Check Out: LuLu by Objective See
Little Snitch Alternatives for Windows
While there is no true alternative to Little Snitch in Windows, we found two applications that came close.
8. Glasswire
GlassWire is quite a simple app which allows you to monitor changes in the system like microphone, webcam or apps in general. It also comes with a firewall feature just like Little Snitch, however, it isn’t that powerful. For example, Little Snitch can allow or refuse to authorize the specific domain and ports of an application trying to access a server online. GlassWire on the other hand only allows or block all connections an application attempts to initiate. There is no option to make specific rules for an app in Glasswire.
Read: 5 Best Network Monitoring Tools for Windows
Price: Glasswire follows the freemium model, The free version of Glasswire shows you which program is connected to which IP address. Although, the paid version of Glasswire has “ask to connect” feature, which gives you a pop-up when an app attempts to make a connection.
Check out: GlassWire
9. Net Limiter
Compared to Glasswire, Net Limiter is a similar alternative to Little Snitch on Windows. Once installed, the app shows you the list of all apps that are making connections to the internet along with their present download and upload speed. You can block network connectivity on individual programs or even restrict how much bandwidth a particular app gets.
Price: Net Limiter is a paid app that cost $29, however it comes with a full 30 days trial.
Check out: Net Limiter
Little Snitch Alternatives
Little Snitch Free
So, these were some of the free and paid alternatives to Little Snitch. It would be nice if Apple would build such detailed functionality into macOS, but they won’t do it for as simple a reason that it’s too hard to use for a regular mac user. So, you can either spend a few bucks and buy little snitch, or use these alternatives, whatever you use, let us know your thoughts and experiences in the comments. And if you ask my opinion, I’d suggest LuLu because of its intuitive UI and simple controls.