Free firewall vs. Privacy intelligence
LuLu by Patrick Wardle (Objective-See) is a respected free firewall for macOS. It does one thing well: warn you when an app makes an outgoing connection and let you allow or block it. That’s it. No traffic monitoring, no tracker detection, no Privacy Scores, no reports. NetMute includes a per-app firewall plus eight additional features around privacy intelligence.
What LuLu can and cannot do
LuLu warns you about new outgoing connections and remembers your allow/block decisions. It is simple, lightweight, and open source. But it lacks: traffic volume tracking, tracker identification, network profiles, data limits, reports, and focus mode integration. LuLu is a lock on your front door. NetMute is a complete security system with cameras, sensors, and alarms.
Free vs. one-time purchase
LuLu is completely free and open source — a generous contribution to the Mac security community. NetMute is a one-time purchase in the Mac App Store. The question is: What is privacy intelligence worth to you? If you spend an hour a week manually researching which domains are trackers, that’s over 50 hours a year. NetMute automates this with its tracker database and Privacy Scoring.
Which should you choose?
Choose LuLu if you want a free, simple firewall and are comfortable making all allow/block decisions yourself. Choose NetMute if you want tracker detection, Privacy Scores, traffic monitoring, network reports, and smart recommendations. You can even use both: LuLu for open-source trust, NetMute for privacy intelligence.