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Picosnitch vs Portmaster: catalog facts
Picosnitch	Portmaster
Free Free, with source code published on GitHub.	Freemium Free and open source under the GPL 3.0. Network history search, per-app bandwidth and the…
Linux	Windows, Linux
Alerts on new connecting or modified programs Per-executable bandwidth history with several breakdowns	Blocks known trackers and malware with no configuration Live list of every connection, attributed to the program that made it
Linux only Monitors and logs traffic but does not block it	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.