The best Ad Blocker alternative to Pi-hole is Portmaster, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 25 alternatives to Pi-hole and many of them are Ad Blockers so hopefully you can find a suitable replacement. Other interesting Ad Blocker alternatives to Pi-hole are AdGuard, NextDNS, RethinkDNS and AdAway.
Pi-hole alternatives are mainly Ad Blockers, but if you're looking for
Privacy Tools or Firewalls 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 Pi-hole.
Portmaster is a (great) local firewall, pi-hole is a dns-blackhole. Not an alternative in the slightest though.