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quien vs Who.is: catalog facts
quien	Who.is
Free Free and open source under the MIT licence.	Freemium Lookups are free; domain history reports and monitoring are paid services.
Windows, Command line	Web
WHOIS, DNS, mail, TLS and HTTP checks in one view Readable tabbed TUI instead of raw whois text	WHOIS, RDAP, DNS and IP lookups in one site Reverse nameserver lookup
Terminal only Young project from a single developer	Full domain history requires a paid report Monitoring is a premium service
Downloadable app	Web application, Hosted service
Open source	Closed source
License: MIT	License not stated
No account needed	Not stated if an account is 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.