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Picosnitch vs OpenSnitch: catalog facts
Picosnitch	OpenSnitch
Free Free, with source code published on GitHub.	Free Free and open source under the GPL.
Linux	Linux
Alerts on new connecting or modified programs Per-executable bandwidth history with several breakdowns	Prompts on every new outbound connection, so unexpected traffic becomes visible Blocks ad, tracker and malware domains system-wide
Linux only Monitors and logs traffic but does not block it	Linux only The first days are a stream of prompts until your rules settle
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.