The best alternative to NextDNS is Portmaster, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 100 alternatives to NextDNS and many of them are so hopefully you can find a suitable replacement. Other interesting alternatives to NextDNS are AdGuard, Adblock Plus, AdGuard DNS and DNS4EU.
NextDNS alternatives are mainly Ad Blockers, but if you're looking for
DNS Resolvers or Privacy Tools you can filter on that. You can also filter by region, for example
EU-based alternatives if you prefer software developed in the European Union. These are just examples - use the filter bar below to find more specific alternatives to NextDNS.
AdGuard is an Adblock browser extension not a DNS service.