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quien vs Robtex: catalog facts
quien	Robtex
Free Free and open source under the MIT licence.	Free Lookups are free on the website.
Windows, Command line	Web
WHOIS, DNS, mail, TLS and HTTP checks in one view Readable tabbed TUI instead of raw whois text	Many lookup types from one search page Covers AS numbers and AS macros as well as domains and IPs
Terminal only Young project from a single developer	Web service only Research shows lookups rather than any monitoring or alerting
Downloadable app	Web application
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 24, 2026

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