objective-see/LuLu

Health v2 · maintenance only

Adoption not part of the score

13103 stars · 597 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

LuLu is a free, open-source macOS firewall that monitors and blocks unknown outgoing network connections. It uses a system extension and network filter to alert users when applications attempt to connect to the network, protecting privacy and stopping malware communication.

Use cases

• block unknown outgoing connections on my mac
• free open-source firewall for macOS
• monitor which apps are making network connections
• stop malware from phoning home
• alternative to Little Snitch
• control per-application network access on macOS

When to choose

• you want a free, open-source macOS firewall with active development
• you need alerts and rules for outbound connections from applications
• you want privacy protection against unauthorized network activity by apps or malware

When to avoid

• you need a firewall for Linux or Windows
• you only need inbound port filtering, which macOS's built-in firewall already provides
• you run macOS older than 10.15

Facets

application · maturity active

security networking privacy security privacy apple-ecosystem firewall macos-firewall network-filter outbound-connections system-extension objective-see macos

Member repositories

For agents

markdown · JSON · MCP: product_card(name="objective-see/LuLu")