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CIRA Canadian ShieldQuad9
Free

Free, provided by a national not-for-profit.

 Free

The public resolvers are free to use.

Windows, macOS, Android, iOS, Browser extension Windows, macOS, Linux, Android, iOS
  • Blocks phishing, malware, botnets and scam sites
  • Optional adult content filtering for families
  • Malicious domain blocking with no configuration and no account
  • Non-profit, Swiss-based, with a published no-client-IP-logging policy
  • Built primarily for Canadian users
  • No custom blocklists or per-domain control described
  • Blocking is security-focused only; it does not block advertising
  • No per-device customisation on the free public resolvers
Downloadable app, Hosted service, Browser extension 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

Checked September 24, 2026

Checked September 22, 2026

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