Best Portmaster Alternatives
Portmaster is an open-source application firewall and privacy suite that monitors and blocks network connections, but Windows/Linux focus and setup complexity lead users to consider alternatives. People look for firewalls with broader platform support, simpler controls, or built-in filtering.
1Network monitor and firewall with visual traffic graphs for Windows and Android.
2Little Snitch
PaidmacOS application firewall that alerts on outgoing connections.
simplewall
Open SourceFree, lightweight firewall for Windows built on the WFP engine.
OpenSnitch
Open SourceOpen-source application firewall for Linux inspired by Little Snitch.
NetGuard
FreemiumOpen-source no-root firewall for Android to control app network access.
pfSense
Open SourceOpen-source network firewall and router platform for whole networks.
OPNsense
Open SourceOpen-source firewall and routing platform with a modern web UI.
Pi-hole
Open SourceNetwork-wide ad and tracker blocker acting as a DNS sinkhole.
TinyWall
FreeLightweight, free firewall controller that hardens Windows Firewall.
NextDNS
FreemiumCloud-based DNS filtering for security, privacy, and parental controls.
Windows Defender Firewall
FreeThe built-in firewall included with Windows for basic connection control.
Safing SPN
SubscriptionSafing's privacy network that complements Portmaster with encrypted routing.
Know a Portmaster alternative we missed? Suggest it — we review submissions before they go live.