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Domain Locker vs DNS Spy: catalog facts
Domain Locker	DNS Spy
Free Open source under MIT for self-hosting; hosted pricing is not stated in the research.	Freemium Monitoring is paid with a 7-day free trial; some one-off tools are free.
Web, Self-hosted	Web
Tracks domains from many registrars in one place Expiry and change alerts through many channels	Record-level change alerts checked from multiple locations Domain and SSL expiry tracking in one place
Most useful only for people managing several domains Some features such as widgets are listed as coming soon	Continuous monitoring requires a paid plan Hosted service only
Self-hosted, Hosted service	Hosted service
Open source	Closed source
License: MIT	License not stated
Not stated if an account is needed	Account 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 October 2, 2026

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