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arp-scan vs Whosthere: catalog facts
arp-scan	Whosthere
Free Free to download and use, with the source published on GitHub.	Free Free and open source under the Apache 2.0 licence.
Linux, Command line	Windows, Command line
Finds devices that do not answer ping Shows MAC address vendors	Interactive terminal UI for browsing discovered devices Discovery runs without elevated privileges
Works only on the local network segment Command line only, usually needs root	Limited to the local network Terminal-only, with no graphical interface
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: Apache-2.0
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 2, 2026

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