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AdGuard Ad Blocker vs Quad9 Connect: catalog facts
AdGuard Ad Blocker	Quad9 Connect
Freemium The iOS app has a free edition and a paid Pro edition; prices for other apps are not…	Free Free and open source; the Quad9 DNS service is also free.
Windows, macOS, Android, iOS, Browser extension	Android
Filters ads and trackers in apps as well as browsers Android app works without root access	Official app from Quad9 Works on Android and ChromeOS
Features differ between the platform versions Licensing details are not stated on the overview page	Tied to the Quad9 DNS service No iOS or desktop version
Downloadable app, Browser extension	Downloadable app
Closed source	Open source
License not stated	License: AGPL-3.0-or-later
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 23, 2026	Official website Full listing and sources Checked October 2, 2026

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