There are many alternatives to Little Snitch for Mac if you are looking for a replacement. The best Mac Network Monitor alternative is Wireshark, 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 seven of them are Network Monitors available for Mac so hopefully you can find a suitable replacement. Other interesting Mac Network Monitor alternatives to Little Snitch are LuLu by Objective-See, Radio Silence, Tiny Shield and FireWally.
Wireshark is a premier network protocol analyzer used globally in industries and education, offering multi-platform support, deep protocol inspection, powerful display filters, and VoIP analysis. It allows both live capture and offline analysis, supporting various networks and protocols.
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 :)
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.
FireWally is a free firewall app for Mac, powered by Apple Intelligence and designed for anyone who wants to take full control of their online activity.
Outbound firewall for apps, blocking apps from accessing internet. Useful for reducing data usage when tethering to mobile data, or on a slower wifi connection.
I like TripMode as an alternative to LittleSnitch because it's simpler UI resembles iOS and it's easy to monitor and block app internet usage. It's also significantly cheaper than LittleSnitch.
VPN Peek is a lightweight menu bar utility that monitors your VPN connection and checks for potential privacy leaks.
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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.