Apps similar to Portmaster include NextDNS, which is open source with a free version. Other options are AdGuard, Pi-hole, simplewall and RethinkDNS. You're spoiled for choice with Firewalls like Portmaster: we list more than 25 alternatives for Windows, Linux, Android, Mac and iPhone.
PEShield — privacy-first Android toolkit for digital sovereignty. A local firewall blocks trackers, ads & telemetry on-device; nothing leaves your phone. Plus an offline security AI, encrypted messenger, mesh/off-grid, a code studio & a camera chip scanner. No Google.
Harbor Privacy is a managed DNS filtering service that blocks ads, trackers, and malicious domains network-wide, with no logging of browsing activity. Includes Harbor Kids, a family protection layer that filters adult content, gaming, dating apps, gambling, and dangerous sites...
Experimental Rust/Aya XDP + TC firewall and traffic analyzer. Low-overhead packet filtering with release evidence still pending for production claims.
PortExpert gives you a detailed vision of your personnal computer cybersecurity. It automatically monitors all applications connected to the Internet and give you all the information you might need to identify potential threats to your system.
France
EU
Real-time network traffic visualizer — see every connection your computer makes. Privacy-first, 100% local. / Visualiseur de trafic réseau en temps réel, 100% local.
FranceEU
spectraNET is a free per-application network monitor for macOS, Windows and Linux. It measures every connection of every program and shows which apps use the network, how much, with whom, and whether anything looks suspicious, as an animated 2.5D city or a 2D map.
ItalyEU
