NextDNS is described as 'Protects you from all kinds of security threats, blocks ads and trackers on websites and in apps and provides a safe and supervised Internet for kids — on all devices and on all networks' and is a very popular Ad Blocker in the security & privacy category. There are more than 100 alternatives to NextDNS for a variety of platforms, including iPhone, Mac, Web-based, iPad and Windows apps. The best NextDNS alternative is Pi-hole, which is both free and Open Source. Other great apps like NextDNS are Portmaster, AdGuard, Adblock Plus and SponsorBlock.