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