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Quad9 vs CIRA Canadian Shield: catalog facts
Quad9	CIRA Canadian Shield
Free The public resolvers are free to use.	Free Free, provided by a national not-for-profit.
Windows, macOS, Linux, Android, iOS	Windows, macOS, Android, iOS, Browser extension
Malicious domain blocking with no configuration and no account Non-profit, Swiss-based, with a published no-client-IP-logging policy	Blocks phishing, malware, botnets and scam sites Optional adult content filtering for families
Blocking is security-focused only; it does not block advertising No per-device customisation on the free public resolvers	Built primarily for Canadian users No custom blocklists or per-domain control described
Hosted service	Downloadable app, Hosted service, Browser extension
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 24, 2026

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