Compare software

Rethink DNS vs Quad9 Connect: catalog facts
Rethink DNS	Quad9 Connect
Free Free and open source under the Apache licence. Optional paid resolver plans exist.	Free Free and open source; the Quad9 DNS service is also free.
Android	Android
Firewall, encrypted DNS and blocklists in one app with detailed logs Supports WireGuard alongside its own filtering	Official app from Quad9 Works on Android and ChromeOS
Uses the VPN slot, though it can proxy a WireGuard tunnel through itself The amount of configuration is daunting at first	Tied to the Quad9 DNS service No iOS or desktop version
Downloadable app	Downloadable app
Open source	Open source
License: Apache-2.0	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 22, 2026	Official website Full listing and sources Checked October 2, 2026

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