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Control D vs Quad9: catalog facts
Control D	Quad9
Freemium A free tier is available. Paid plans are charged per endpoint.	Free The public resolvers are free to use.
Windows, macOS, Linux, Android, iOS	Windows, macOS, Linux, Android, iOS
Per-device profiles and very granular per-service rules Encrypted DNS with apps for every major platform	Malicious domain blocking with no configuration and no account Non-profit, Swiss-based, with a published no-client-IP-logging policy
Filtering happens on their infrastructure, so they see your lookups Most useful features are behind a paid plan	Blocking is security-focused only; it does not block advertising No per-device customisation on the free public resolvers
Downloadable app, Hosted service	Hosted service
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 22, 2026

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