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OpenSnitch vs Picosnitch: catalog facts
OpenSnitch	Picosnitch
Free Free and open source under the GPL.	Free Free, with source code published on GitHub.
Linux	Linux
Prompts on every new outbound connection, so unexpected traffic becomes visible Blocks ad, tracker and malware domains system-wide	Alerts on new connecting or modified programs Per-executable bandwidth history with several breakdowns
Linux only The first days are a stream of prompts until your rules settle	Linux only Monitors and logs traffic but does not block it
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License not stated
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 24, 2026

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