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Portmaster vs Fort Firewall: catalog facts
Portmaster	Fort Firewall
Freemium Free and open source under the GPL 3.0. Network history search, per-app bandwidth and the…	Free Free and open source.
Windows, Linux	Windows
Blocks known trackers and malware with no configuration Live list of every connection, attributed to the program that made it	Per-application and global network rules Wildcards and parent-process based rules
Windows and Linux only Network history search and bandwidth figures are paid features	Windows only Requires familiarity with firewall rules
Downloadable app	Downloadable app
Open source	Open 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.