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DNSViz vs Zonemaster: catalog facts
DNSViz	Zonemaster
Free Free to use online and open source under GPL-2.0.	Free Free to use online and free to install as open-source software.
macOS, Linux, Web, Command line	Web, Self-hosted
Graphs the DNSSEC chain of trust in a way that is easy to follow Lists detected configuration errors	Tests the whole delegation path from the root down Includes DNSSEC checks
Focused on DNSSEC rather than general DNS or mail checks The graphs take some DNS knowledge to read	Focused on DNS delegation, not email or web checks Reports assume some DNS knowledge to act on
Downloadable app, Web application	Web application, Self-hosted
Open source	Open source
License: GPL-2.0	License not stated
No account needed	No account needed
Not stated if it works offline	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.