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