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Domain Locker vs Who.is: catalog facts
Domain Locker	Who.is
Free Open source under MIT for self-hosting; hosted pricing is not stated in the research.	Freemium Lookups are free; domain history reports and monitoring are paid services.
Web, Self-hosted	Web
Tracks domains from many registrars in one place Expiry and change alerts through many channels	WHOIS, RDAP, DNS and IP lookups in one site Reverse nameserver lookup
Most useful only for people managing several domains Some features such as widgets are listed as coming soon	Full domain history requires a paid report Monitoring is a premium service
Self-hosted, Hosted service	Web application, Hosted service
Open source	Closed source
License: MIT	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	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.