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

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