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DNSlytics vs quien: catalog facts
DNSlytics	quien
Freemium Free tools on the website; premium website access, monitoring and the API are paid monthly…	Free Free and open source under the MIT licence.
Web	Windows, Command line
Reverse IP, name server and mail server lookups in one place More than ten years of historical DNS data	WHOIS, DNS, mail, TLS and HTTP checks in one view Readable tabbed TUI instead of raw whois text
Page views and features are limited without a premium plan IP and DNS data is refreshed every 14 days rather than live	Terminal only Young project from a single developer
Web application, Hosted service	Downloadable app
Closed source	Open source
License not stated	License: MIT
No account needed	No account needed
Needs internet	Needs internet
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 2, 2026

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