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Zonemaster vs DNSViz: catalog facts
Zonemaster	DNSViz
Free Free to use online and free to install as open-source software.	Free Free to use online and open source under GPL-2.0.
Web, Self-hosted	macOS, Linux, Web, Command line
Tests the whole delegation path from the root down Includes DNSSEC checks	Graphs the DNSSEC chain of trust in a way that is easy to follow Lists detected configuration errors
Focused on DNS delegation, not email or web checks Reports assume some DNS knowledge to act on	Focused on DNSSEC rather than general DNS or mail checks The graphs take some DNS knowledge to read
Web application, Self-hosted	Downloadable app, Web application
Open source	Open source
License not stated	License: GPL-2.0
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.