LuLu vs Portmaster
Side-by-side comparison of features, pricing, ratings, and alternatives.
LuLu is a free and open-source firewall for macOS built by Objective-See, designed to monitor and control outgoing network connections rather than inbound traffic. It alerts users whenever an unknown or unrecognized process attempts to connect out to the network, helping catch malware trying to exfiltrate data or reach command-and-control servers.
Portmaster, made by the Austria-based company Safing, is a free and open-source application firewall for Windows and Linux that gives users visibility into every network connection made by every application on their computer. Rather than just blocking traffic at the network edge, it lets users set per-application rules to allow, block, or restrict specific programs, and can completely isolate an app from the internet if desired. Beyond application-level control, Portmaster blocks ads and trackers system-wide at the DNS level, meaning the protection applies across all applications rather than just a browser. It supports restricting connections by country and blocking specific domains directly. Safing also offers SPN, a separate paid privacy network product, and a Pro tier for Portmaster itself, alongside the free core firewall application.
- Completely free and open source, including the source code on GitHub
- Effective at catching malware attempting outbound data exfiltration
- Built by Objective-See, a developer with a strong reputation in Mac security tooling
- Granular per-app, per-destination rule control
- Free and open source with a transparent, publicly reviewable codebase
- System-wide DNS-level ad and tracker blocking, not limited to a single browser
- Granular per-application network control not found in most consumer firewalls
- Active development with recent updates and an engaged community
- macOS only, no Windows or Linux version
- Frequent connection alerts can be noisy until rules are tuned
- Requires some technical familiarity with network processes to configure effectively
- No macOS support currently, only Windows and Linux
- More technical than typical consumer security software, aimed at privacy-focused users
- Optional Pro/SPN pricing (80 EUR/year) is not prominently broken down on the main site
More alternatives & similar tools
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See and control every outgoing connection on your Mac with this application firewall.
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See and control every outgoing connection on your Mac with this application firewall.
The Verdict
AI-generated from listing dataLuLu is a free, macOS‑only open‑source firewall focused on outbound traffic control, while Portmaster is a free‑plus‑paid, cross‑platform firewall that adds system‑wide ad/tracker blocking.
Key differences
- •Platform support: LuLu runs only on macOS; Portmaster runs on Windows and Linux.
- •Ad‑tracker blocking: Portmaster includes DNS‑level ad/tracker blocking; LuLu does not.
- •Pricing model: Both are free and open source, but Portmaster offers an optional paid privacy network add‑on.
- •Rule granularity: LuLu offers per‑app, per‑destination rules with three modes; Portmaster offers per‑app rules plus domain‑ and country‑level restrictions.
- •User experience: LuLu can be noisy with alerts until tuned; Portmaster is also technical but adds broader privacy features.
Pricing & value
Both are free and open source, but LuLu has no paid add‑on, giving pure zero cost.
Ease of use / learning curve
Portmaster’s UI includes DNS‑level blocking, but both are technical; LuLu’s frequent alerts can be noisier initially.
Features & depth
Portmaster adds system‑wide ad/tracker blocking and country‑level restrictions beyond LuLu’s outbound firewall.
Integrations & ecosystem
LuLu integrates with VirusTotal and verifies code signing; Portmaster lists no such integrations.
Support
Both are open source with community visibility on GitHub; no formal support mentioned for either.
Security & privacy
LuLu focuses on preventing outbound malware exfiltration with code‑sign verification; Portmaster focuses on privacy but lacks macOS support.
Migration / lock‑in
Both provide rule export/import and are open source, so migration effort is comparable.
Choose LuLu if…
Mac users needing a free, open‑source firewall that blocks unauthorized outbound connections.
Choose Portmaster if…
Windows or Linux users wanting a free firewall plus optional ad/tracker blocking and broader privacy controls.
Common questions
Can I use LuLu on Windows or Linux?
No, LuLu is macOS‑only.
Does Portmaster block ads and trackers?
Yes, it blocks ads and trackers system‑wide at the DNS level.
Is there any cost to use either product?
Both are free and open source; Portmaster offers an optional paid privacy network add‑on.