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WatchYourLAN vs NetAlertX: catalog facts
WatchYourLAN	NetAlertX
Free Free to run yourself, with the source published on GitHub.	Free Free to run on your own hardware.
Linux, Self-hosted	Self-hosted
Notifications when an unknown device joins the network Online and offline history for each host	Continuous discovery of devices on the network Alerts when devices appear or disappear
Covers the local network only Needs a machine that stays on to keep watching	Needs a server or always-on machine to run Setup takes more effort than a one-off scan
Self-hosted	Self-hosted
Closed source	Closed source
License not stated	License not stated
No account needed	No account needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 23, 2026

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