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quien vs ViewDNS.info: catalog facts
quien	ViewDNS.info
Free Free and open source under the MIT licence.	Freemium The web tools are free; API access and research data are sold on paid plans.
Windows, Command line	Web
WHOIS, DNS, mail, TLS and HTTP checks in one view Readable tabbed TUI instead of raw whois text	Many DNS, WHOIS and IP tools in one place Historical data such as IP history and reverse WHOIS
Terminal only Young project from a single developer	Some features such as dark mode need an account API and data products are paid
Downloadable app	Web application, Hosted service
Open source	Closed source
License: MIT	License not stated
No account needed	No account needed
Needs internet	Needs internet
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 23, 2026

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