Firewalls

Best Privacy-Focused Firewalls
(2025)

Portmaster

Powerful (& beautiful) firewall program for Windows & Linux to give you finer control over what your device connects to.

Open Source Windows Linux Official Web

Lulu

Firewall program for MacOS to give you finer control over what your device connects to.

Open Source macOS Official Web

rethinkDNS

Block malware, spyware, ads, and trackers across all apps with Rethink DNS. Servers in 300+ locations: Experience Blazing fast speeds.

Open Source Android Official Web

NetGuard

Firewall program for Android (no root required) to give you finer control over what your device connects to. Warning: NetGuard by default takes the place of a VPN on Android.