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Picosnitch vs NetworkUsageView: catalog facts
Picosnitch	NetworkUsageView
Free Free, with source code published on GitHub.	Free Freeware from NirSoft with no paid tier.
Linux	Windows
Alerts on new connecting or modified programs Per-executable bandwidth history with several breakdowns	Shows historical data use per app and per user Summary modes by app, user or both
Linux only Monitors and logs traffic but does not block it	Works only on Windows 8, 10 and 11 Data is recorded hourly, not in real time
Downloadable app	Downloadable app
Open source	Closed source
License not stated	License: Freeware
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 24, 2026	Official website Full listing and sources Checked October 8, 2026

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