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NetPeek vs Whosthere: catalog facts
NetPeek	Whosthere
Free Free and open source under the GPL 3.	Free Free and open source under the Apache 2.0 licence.
Linux	Windows, Command line
Simple GNOME interface for network discovery Shows open ports on discovered devices	Interactive terminal UI for browsing discovered devices Discovery runs without elevated privileges
Linux only Far fewer options than a full scanner like Nmap	Limited to the local network Terminal-only, with no graphical interface
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License: Apache-2.0
No account needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 2, 2026

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