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Portmaster vs Little Snitch: catalog facts
Portmaster	Little Snitch
Freemium Free and open source under the GPL 3.0. Network history search, per-app bandwidth and the…	Paid A one-time purchase is required after the demo period.
Windows, Linux	macOS
Blocks known trackers and malware with no configuration Live list of every connection, attributed to the program that made it	Per-application outbound rules with a clear prompt at the moment of connection Network monitor shows exactly which process is talking to where
Windows and Linux only Network history search and bandwidth figures are paid features	One-time paid licence, macOS only The initial flood of prompts takes patience to train
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-3.0	License not stated
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked September 22, 2026

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