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Windows Firewall Control vs Portmaster: catalog facts
Windows Firewall Control	Portmaster
Free Free to download and use.	Freemium Free and open source under the GPL 3.0. Network history search, per-app bandwidth and the…
Windows	Windows, Linux
Prompts when unknown programs try to connect out One-click switching between filtering modes	Blocks known trackers and malware with no configuration Live list of every connection, attributed to the program that made it
Windows only Medium filtering needs rules for every program you use	Windows and Linux only Network history search and bandwidth figures are paid features
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 21, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.