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BuiltWith vs WhatRuns: catalog facts
BuiltWith	WhatRuns
Freemium Free single-site lookups with paid plans for reports and bulk data.	Free Free extension with no sign-up required.
Web, Browser extension	Browser extension
Identifies CMS, analytics, CDN and hosting from a single domain Free lookups for individual sites	One-click technology detection Covers plugins, fonts, analytics and CDNs
Detailed reports and bulk data require paid plans Detection is inference-based and can miss or misreport technologies	Proprietary Only a Chrome version is mentioned
Hosted service, Browser extension	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.