The best Firewall alternative to Little Snitch is Portmaster, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 25 alternatives to Little Snitch and many of them are Firewalls so hopefully you can find a suitable replacement. Other interesting Firewall alternatives to Little Snitch are LuLu by Objective-See, GlassWire, NetGuard and NetLimiter.
Portmaster is a free and open-source privacy suite that puts you back in charge of your computer.
Portmaster is the most popular Windows & Linux alternative to Little Snitch.
Portmaster is the most popular Open Source & free alternative to Little Snitch.
LuLu is the free, shared-source macOS firewall that aims to block unknown outgoing connections unless explicitly approved by the user.
I've used Little Snitch for many years. However, after buying a new Mac I was faced with buying licences for a whole bunch of apps I had paid for several times in the past. Given this unwanted additional expense and the fact that I really don't need all the extra features of the later versions of Little Snitch, I decided to try alternatives. LuLu absolutely fits the bill for the purpose of stopping apps phoning home without your permission.
Free (Libre) Software is and will be always best for the humanity :)
Almost everyone thinks LuLu by Objective-See is a great Little Snitch alternative.
LuLu by Objective-See is the most popular Mac alternative to Little Snitch.
Visualizes real-time and historical network activity, delivers alerts for suspicious behavior and unknown connections, manages firewall rules, reports DNS and system changes, identifies remote hosts, monitors app usage, supports remote monitoring, and detects possible threats.
Good software, reputable developers and it has even more features than Little Snitch.
Some users think GlassWire is a great Little Snitch alternative, some don't.
GlassWire is the most popular Android & Android Tablet alternative to Little Snitch.
NetGuard provides simple and advanced ways to block access to the internet - no root required.
Comprehensive Windows software for internet traffic control, enabling users to set bandwidth limits for applications or connections. Offers real-time monitoring, long-term stats per app, and detailed internet usage reports. Ideal for managing data efficiently and enhancing network performance.
The ltest version makes it impossible to block Windows System and Windows Apps.
NWO is collecting data on us...
Some users think NetLimiter is a great Little Snitch alternative, some don't.
NetLimiter is the most popular commercial alternative to Little Snitch.
A powerful tool which extends the functionality of Windows Firewall and provides new extra features which makes Windows Firewall better.
InviZible Pro uses DNSCrypt Protocol, Tor and i2pd (I2P Daemon) (PurpleI2P) to achieve maximum security, privacy and comfortable use of the Internet.
Radio Silence lets you block individual apps from accessing the internet. It never throws pop-ups on the screen, and is completely invisible.
Tiny Shield keeps your network safe by watching all connections and stopping bad stuff before it can harm your computer. Tiny Shield keeps an eye on everything your Mac connects to, making sure you can see all your internet activity in one place.
Ufw stands for Uncomplicated Firewall, and is program for managing a netfilter firewall. It provides a command line interface and aims to be uncomplicated and easy to use.
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I Wanted a tool to replace Little Snitch, and this one is GREAT. It is Free, Open Source, and very lite weight.