Compare software

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from the root down Includes DNSSEC checks	Shows each step of the DNSSEC chain of trust Custom trust anchors for testing unpublished keys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