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Quad9 vs AdGuard DNS: catalog facts
Quad9	AdGuard DNS
Free The public resolvers are free to use.	Freemium The public resolvers are free. Private DNS accounts with custom rules are paid beyond a…
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	Works through Android Private DNS with no app to install Supports DNS-over-QUIC as well as the usual encrypted transports
Blocking is security-focused only; it does not block advertising No per-device customisation on the free public resolvers	Filtering happens on their servers, so they see your lookups Custom rules and statistics need a paid account beyond a small free tier
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.