3 Free and Open-source Firewall Apps for macOS (Intel and Apple Silicon)

1- LuLu

free open-source macOS firewall engine

LuLu is the free, open-source firewall that aims to block unknown outgoing connections, protecting your privacy and your Mac!

Read about LuLu 's features, license, platforms, and more.

2- Mergen

macOS Audit and Security Check Tool

Mergen is an open-source, native macOS application for auditing and checking the security of your Mac. It scans your system for security issues based on the Center for Internet Security (CIS) Benchmark, and checks various settings and configurations related to security and privacy.

Read about Mergen 's features, license, platforms, and more.

3- Murus Lite

Firewall manager for macOS

Murus macOS Firewall Unchained with rich-feature set and native user macOS user-interface. It's super user-friendly especially for non-technical users.

Murus unleashes the great power of the macOS built-in PF firewall. Protect your network resources using a very simple interface, take advantage of the many pro features available to design and implement your network infrastructure, to monitor performances and proactively filter dangerous traffic at network layer.

Murus is available in three different versions in order to meet everyone’s needs.

And there’s even more: port knocking, adaptive firewall, NAT and many other features including a blazing-fast logging system.

Read about Murus Lite 's features, license, platforms, and more.