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AdGuard DNS vs Quad9: catalog facts
AdGuard DNS	Quad9
Freemium The public resolvers are free. Private DNS accounts with custom rules are paid beyond a…	Free The public resolvers are free to use.
Windows, macOS, Linux, Android, iOS	Windows, macOS, Linux, Android, iOS
Works through Android Private DNS with no app to install Supports DNS-over-QUIC as well as the usual encrypted transports	Malicious domain blocking with no configuration and no account Non-profit, Swiss-based, with a published no-client-IP-logging policy
Filtering happens on their servers, so they see your lookups Custom rules and statistics need a paid account beyond a small free tier	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
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.