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Who.is vs quien: catalog facts
Who.is	quien
Freemium Lookups are free; domain history reports and monitoring are paid services.	Free Free and open source under the MIT licence.
Web	Windows, Command line
WHOIS, RDAP, DNS and IP lookups in one site Reverse nameserver lookup	WHOIS, DNS, mail, TLS and HTTP checks in one view Readable tabbed TUI instead of raw whois text
Full domain history requires a paid report Monitoring is a premium service	Terminal only Young project from a single developer
Web application, Hosted service	Downloadable app
Closed source	Open source
License not stated	License: MIT
Not stated if an account is 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.