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Quad9 vs OpenDNS Home: catalog facts
Quad9	OpenDNS Home
Free The public resolvers are free to use.	Free The home DNS service is free to use.
Windows, macOS, Linux, Android, iOS	Windows, macOS, Linux, Android, iOS
Malicious domain blocking with no configuration and no account Non-profit, Swiss-based, with a published no-client-IP-logging policy	Network-wide filtering set once at the router Content filtering suited to parental controls
Blocking is security-focused only; it does not block advertising No per-device customisation on the free public resolvers	Queries go to a US company's resolver Website mostly promotes Cisco's enterprise products
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	Needs internet
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 23, 2026

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