Comparison

CoreLock vs LuLu

LuLu is Objective-See's free, open-source outbound firewall, with allow and block rules for connections, and CoreLock doesn't make connection rules. CoreLock is a six-check scan of running apps, network, app permissions, startup items, AI agents and Downloads, so the two do different jobs.

Last reviewed October 29, 2026 · 1 source

CoreLock and LuLu, side by side

LuLu's column was checked on October 13, 2026 against its own pages and dated reviews (sources below). Rows with nothing checked are left out.

Feature	CoreLock	LuLu
Firewall	Free switches for the macOS Firewall and Stealth mode (admin password needed). No per-app connection blocking	An outbound firewall with allow and block rules for connections
Price	Scan free, no account. Pro $9.99 a month or $50 a year, the same at renewal	Free and open source

What CoreLock doesn't do

Rules that allow or block a connection: CoreLock doesn't create them, and its Shields only switch the macOS Firewall and Stealth mode.
Open source code: CoreLock's isn't public.

Frequently Asked Questions

Does CoreLock block outbound connections like LuLu?

No. CoreLock doesn't create allow or block rules for connections. Its Shields switch the macOS Firewall and Stealth mode; Stealth mode ignores ping and probes of closed ports, but it doesn't hide the Mac's IP address or close every listening service.

Is LuLu free?

Yes: LuLu is a free, open-source firewall from Objective-See. CoreLock's local scan is free too, as often as you like, with no account; Pro is $9.99/month, $50/year, or $200 once for Lifetime.