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DNSSEC Debugger vs Zonemaster: catalog facts
DNSSEC Debugger	Zonemaster
Free Free to use online.	Free Free to use online and free to install as open-source software.
Web	Web, Self-hosted
Shows each step of the DNSSEC chain of trust Custom trust anchors for testing unpublished keys	Tests the whole delegation path from the root down Includes DNSSEC checks
Covers DNSSEC only Output assumes some DNSSEC knowledge	Focused on DNS delegation, not email or web checks Reports assume some DNS knowledge to act on
Web application	Web application, Self-hosted
Closed source	Open source
License not stated	License not stated
Not stated if an account is needed	No account needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 23, 2026

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