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sdns vs Knot Resolver: catalog facts
sdns	Knot Resolver
Free Free to use from its GitHub repository.	Free Free to download and use under the GPL.
Linux, Self-hosted, Command line	Linux, Self-hosted
Full recursive resolution without a public upstream Built-in blocklist filtering	Small core with features in optional C and Lua modules Scales from home routers to large deployments
Configured by file with no graphical interface Smaller community than Unbound or Pi-hole	Configured by hand, with no graphical dashboard Some newer features, such as unencrypted DoH mode, are still alpha
Self-hosted	Self-hosted
Closed source	Open source
License not stated	License: GPL
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 October 2, 2026	Official website Full listing and sources Checked September 23, 2026

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