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Quad9 vs Yandex DNS: catalog facts
Quad9	Yandex DNS
Free The public resolvers are free to use.	Free Free to use.
Windows, macOS, Linux, Android, iOS	Web
Malicious domain blocking with no configuration and no account Non-profit, Swiss-based, with a published no-client-IP-logging policy	No software to install, only a DNS setting change Optional blocking of adult and dangerous sites
Blocking is security-focused only; it does not block advertising No per-device customisation on the free public resolvers	All DNS lookups go to Yandex Little control over the block lists compared with self-hosted filters
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	Needs internet
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked October 1, 2026

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