Alternatives to Little Snitch

macOS application firewall that prompts on outgoing connections. The listings below can replace it for an important use case. Each note says what changes if you switch.

Replacements

Listings that take over the same core job as Little Snitch.

  • LuLu

    Control outbound application connections on macOS.

    FreeOpen sourcemacOS

    LuLu is a free, open-source GPL-3.0 macOS firewall for outbound connections, replacing Little Snitch's one-time paid licence with no cost.

  • OpenSnitch

    An interactive application firewall for Linux that asks before letting any program make an outbound connection.

    FreeOpen sourceLinux

    OpenSnitch is a free open-source interactive application firewall for Linux rather than macOS.

  • Portmaster

    Shows every connection each application makes and lets you block any of them, with sensible defaults already set.

    FreemiumOpen sourceWindowsLinux

    Portmaster controls per-application connections on Windows and Linux with preset blocking rather than macOS.

  • GlassWire

    Network monitor and firewall with a visual traffic history.

    FreemiumProprietaryWindowsAndroid

    GlassWire monitors and firewalls network traffic on Windows and Android with a visual history rather than macOS prompts.

  • simplewall

    Puts a plain list of programs in front of the Windows Filtering Platform, so you decide what is allowed online.

    FreeOpen sourceWindows

    simplewall controls which Windows programs reach the internet using the Windows Filtering Platform rather than macOS.

Also worth comparing

These listings name Little Snitch as their own alternative, so the relationship runs both ways.

  • Radio Silence

    A lightweight outbound firewall and network monitor for macOS that blocks individual apps from the internet.

    PaidProprietarymacOS

    Little Snitch prompts on each new outgoing connection instead of relying on manual blocking, and adds a network monitor, sold as a one-time paid macOS licence.

Similar software

Related functionality, not a direct replacement.