AdGuard vs Quad9

AdGuard is a family of apps and services for filtering content across desktop and mobile devices. Its tools include custom filter lists, an element picker and cookie-popup blocking. The listed apps cover Windows, Mac, Android, Android TV, iOS, browsers and Linux, while AdGuard Home can extend coverage across a home network when installed on a router. Security features block phishing, malware, dangerous and malicious sites, and inappropriate content. AdGuard Content Blocker and AdGuard DNS are free products; Content Blocker works in Samsung Internet and Yandex Browser, with fewer features than the Android version. Personal licenses cover three devices and Family licenses cover nine. Licenses are available for one year or a lifetime, with annual billing or a one-time payment, but no prices are listed. Trials last 14 days for Windows, Mac, Android and Android TV, and seven days for iOS Premium. Purchases have a 30-day money-back guarantee for requests within 30 days. Support is available by email 24/7.

Quad9 is a free recursive DNS service that blocks requests to domains associated with malware, viruses, adware, phishing and scams. It draws on threat information from more than 20 partners to identify malicious domains. The service supports DNS over TLS, DNS over HTTPS and DNSCrypt, and provides DNSSEC validation on its resolver services. Quad9 says it does not store end-user IP addresses and operates under Swiss privacy law. Its focus is malicious-domain blocking, not content filtering; it also does not offer custom domain policies. Setup documentation covers Cloudflared, Pi-hole and open-source routers including pfSense, OPNsense, OpenWrt, MikroTik RouterOS and IPFire. Support assists with setup questions and issues. Quad9 reports 99.999% uptime for its global anycast service. The service costs nothing, with no contract or sign-up process, and is listed for Android, iOS, Linux, macOS and Windows. Large organizations planning high-volume DNS traffic are asked to contact Quad9 first.