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wtfis vs quien: catalog facts
wtfis	quien
Free Free and open source under MIT.	Free Free and open source under the MIT licence.
Command line	Windows, Command line
Collects domain, hostname, and IP details in one lookup Combines information from several public data services	WHOIS, DNS, mail, TLS and HTTP checks in one view Readable tabbed TUI instead of raw whois text
Lookups depend on external services and their quotas Some data sources require API credentials	Terminal only Young project from a single developer
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: MIT
Not stated if an account is needed	No account needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked October 8, 2026	Official website Full listing and sources Checked October 2, 2026

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