Little Snitch is probably the best host-based application firewall solution for macOS app. I’ve been using it for quite a while but recently ditched it when I found a free alternative that equally works great.

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. Little Snitch can block internet traffic of a particular app. Can I do something similar without (paying) Little Snitch, either by using free alternatives or configuring the OS X firewall directly? Macos network software-recommendation security.

If you’re using the free version of Little Snitch, you have to deal with the fact that it automatically quits after every three hours. To avoid this, you have to buy the full version. If you’ve been looking for a free Little Snitch alternative that works with macOS Mojave and previous macOS versions, Lulu is what you need.

Unlike Little Snitch, Lulu is an open source software with its source code already on GitHub. This means that it’s not just free, but also anyone can contribute to its development.

Same approach to application firewall

If you’ve been using Little Snitch before now, you shouldn’t have a problem using Lulu. Lulu uses the same approach to application firewall as Little Snitch; it alerts you of outgoing connections and asks you confirm every connection your apps are trying to make.

After installing it, you can choose to allow all default Apple apps and existing third-party apps to connect to the Internet without confirmation.

The choice you make here depends on how you wish to use the program. Personally, I only allow Apple-signed programs to connect automatically, all third-party apps require manual confirmation to create rules.

Clicking the Block or Allow button determines whether the application will access the Internet or not. Checking the temporarily box makes the rule temporary for that specific program ID. It resets when you quit the app or restart your computer and the dialogue box will pop up again.

Just like Little Snitch, it has a panel where you can remove existing rules and add new ones manually:

Ever since I upgraded to macOS Mojave, I’ve been using the new system-wide dark theme which Lulu neatly blends in with.

For a free app, Lulu is incredibly well-built. It’s been about a week now and I haven’t encountered a bug. If you don’t want to spend a dime on a firewall app, this free little alternative is really worth trying. You can download it from the official website or take a look at the source code on GitHub.

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Thanks to the silent mode, you can turn off all cautions about connections for a while, so as not to be distracted from work. You can configure the work of Little snitch on profiles such as home, office or Internet cafe by activating the pattern in the status menu. Automatic profile switching will allow you to link different networks to specific designs. A new local firewall built into Little Snitch will allow you also to gain control over incoming connections.

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