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WhoIsConnectedSniffer vs NetworkConnectLog: catalog facts
WhoIsConnectedSniffer	NetworkConnectLog
Free Freeware from NirSoft; it may not be sold or bundled with commercial products.	Free Freeware from NirSoft, free to use and redistribute without charge.
Windows	Windows
Passive discovery that sends no packets to other devices Shows operating system, description and IPv6 address that scanners may miss	No installation, runs as a single executable Can export the log automatically on every change
Requires the Npcap or Network Monitor capture driver Only detects devices that send packets the computer receives, and not on other subnets	Smartphones that ignore ARP requests may appear disconnected Windows only
Downloadable app	Downloadable app
Closed source	Closed source
License: Freeware	License: Freeware
No account needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 8, 2026	Official website Full listing and sources Checked October 8, 2026

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