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WhatCMS vs WhatRuns: catalog facts
WhatCMS	WhatRuns
Free Checking a single URL on the website is free; reports and batch detection are separate…	Free Free extension with no sign-up required.
Web	Browser extension
Detects about 1,540 website technologies Reports framework, language, hosting and CDN alongside the CMS	One-click technology detection Covers plugins, fonts, analytics and CDNs
Detection relies on visible artifacts and can miss customised sites Lead generation features go beyond simple site checks	Proprietary Only a Chrome version is mentioned
Web application	Browser extension
Closed source	Closed source
License not stated	License not stated
No account needed	No account needed
Needs internet	Needs internet
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.