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intoDNS vs Zonemaster: catalog facts
intoDNS	Zonemaster
Free Free to use in the browser.	Free Free to use online and free to install as open-source software.
Web	Web, Self-hosted
Single report covering DNS and mail servers Gives fix suggestions with links to the protocol documentation	Tests the whole delegation path from the root down Includes DNSSEC checks
Checks one domain at a time with no monitoring No DNSSEC visualization or propagation view	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
No account 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.