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

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