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WhatCMS vs WhatWeb: catalog facts
WhatCMS	WhatWeb
Free Checking a single URL on the website is free; reports and batch detection are separate…	Free Free and open source under GPLv2.
Web	Windows, macOS, Linux, Command line
Detects about 1,540 website technologies Reports framework, language, hosting and CDN alongside the CMS	Fingerprints hundreds of web technologies via plugins Adjustable aggression levels
Detection relies on visible artifacts and can miss customised sites Lead generation features go beyond simple site checks	Command-line only Intended only for authorized testing
Web application	Downloadable app
Closed source	Open source
License not stated	License: GPL-2.0
No account needed	No account needed
Needs internet	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 24, 2026

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