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