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ViewDNS.info vs quien: catalog facts
ViewDNS.info	quien
Freemium The web tools are free; API access and research data are sold on paid plans.	Free Free and open source under the MIT licence.
Web	Windows, Command line
Many DNS, WHOIS and IP tools in one place Historical data such as IP history and reverse WHOIS	WHOIS, DNS, mail, TLS and HTTP checks in one view Readable tabbed TUI instead of raw whois text
Some features such as dark mode need an account API and data products are paid	Terminal only Young project from a single developer
Web application, Hosted service	Downloadable app
Closed source	Open source
License not stated	License: MIT
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 October 2, 2026

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