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WhatWeb vs Netcraft Site Report: catalog facts
WhatWeb	Netcraft Site Report
Free Free and open source under GPLv2.	Free Free to use under Netcraft's fair use policy.
Windows, macOS, Linux, Command line	Web
Fingerprints hundreds of web technologies via plugins Adjustable aggression levels	Shows hosting, server and technology details in one report Includes hosting history and certificate details
Command-line only Intended only for authorized testing	Subject to a fair use policy Some features may not work in older browsers
Downloadable app	Web application
Open source	Closed source
License: GPL-2.0	License not stated
No account needed	No account needed
Works offline	Needs internet
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 23, 2026

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