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Portmaster vs simplewall: catalog facts
Portmaster	simplewall
Freemium Free and open source under the GPL 3.0. Network history search, per-app bandwidth and the…	Free Free and open source under the GPL 3.0.
Windows, Linux	Windows
Blocks known trackers and malware with no configuration Live list of every connection, attributed to the program that made it	A plain allow and block list rather than a stream of pop-ups Internal block list aimed at Windows telemetry
Windows and Linux only Network history search and bandwidth figures are paid features	The project itself says it is for advanced users Not a Windows Firewall interface; it uses a separate rule system
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-3.0
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 21, 2026

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