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LuLu

brew install --cask lulu v4.3.2

Open-source firewall that intercepts and blocks unauthorized outgoing connections on macOS.

Why you might care

LuLu provides granular control over which apps can access the network, with a focus on blocking unexpected outbound connections before they happen. It's free, open-source, and runs locally without cloud dependencies—useful for privacy-conscious users or those wanting to detect suspicious app behavior.

Categories

security firewall network system-utility

Alternatives

Little Snitch Radio Silence Hands Off!
1.6k
30-day installs · #208
5.0k
90-day · #205
15.0k
365-day · #224

Links

Blurb generated by claude-haiku-4-5 on today.

Raw metadata 
{
  "alternatives": [
    "Little Snitch",
    "Radio Silence",
    "Hands Off!"
  ],
  "artifacts": [
    {
      "app": [
        "LuLu.app"
      ],
      "target": "/Applications/LuLu.app"
    },
    {
      "zap": [
        {
          "trash": [
            "~/Library/Caches/com.objective-see.lulu",
            "~/Library/Caches/com.objective-see.lulu.helper",
            "~/Library/Preferences/com.objective-see.lulu.helper.plist",
            "~/Library/Preferences/com.objective-see.lulu.plist"
          ]
        }
      ]
    }
  ],
  "auto_updates": null,
  "categories": [
    "security",
    "firewall",
    "network",
    "system-utility"
  ],
  "deprecated": 0,
  "deprecation_reason": null,
  "desc": "Open-source firewall to block unknown outgoing connections",
  "disable_reason": null,
  "disabled": 0,
  "display_name": "LuLu",
  "enrichment_fetched_at": "2026-06-20T22:45:59+00:00",
  "first_seen": "2026-06-20T00:47:34+00:00",
  "full_token": "lulu",
  "github_default_branch": null,
  "github_last_commit_at": null,
  "github_readme_excerpt": null,
  "github_repo": null,
  "github_stars": null,
  "github_topics": [],
  "homepage": "https://objective-see.org/products/lulu.html",
  "homepage_og_description": null,
  "homepage_og_image": "https://objective-see.com/images/LL/alert.png",
  "homepage_title": "Objective-See: LuLu",
  "installs_30d": 1580,
  "installs_365d": 15049,
  "installs_90d": 5033,
  "last_seen": "2026-06-20T00:47:34+00:00",
  "llm_generated_at": "2026-06-20T23:03:23+00:00",
  "llm_model": "claude-haiku-4-5",
  "names": [
    "LuLu"
  ],
  "one_liner": "Open-source firewall that intercepts and blocks unauthorized outgoing connections on macOS.",
  "rank_30d": 208,
  "rank_365d": 224,
  "rank_90d": 205,
  "raw_hash": "dd13b82c838a3534",
  "ruby_source_path": "Casks/l/lulu.rb",
  "tap": "homebrew/cask",
  "token": "lulu",
  "version": "4.3.2",
  "why_use_this": "LuLu provides granular control over which apps can access the network, with a focus on blocking unexpected outbound connections before they happen. It\u0027s free, open-source, and runs locally without cloud dependencies\u2014useful for privacy-conscious users or those wanting to detect suspicious app behavior."
}