DNS-Based Ad Blocking: The Concept
Unlike browser extensions that block ads after a page starts loading, DNS-based ad blockers prevent your device from ever connecting to ad and tracking servers. When a domain is on a blocklist, the DNS resolver returns nothing (or a dummy response), and the request dies before it starts. This approach works across all devices on your network — phones, smart TVs, game consoles — without any per-device configuration.
Two tools dominate this space for home users: Pi-hole and AdGuard Home. Both are free, open-source, and self-hosted, but they differ in meaningful ways.
Pi-hole
Pi-hole is the original and most widely known network-wide ad blocker. Originally designed to run on a Raspberry Pi (hence the name), it now runs on most Linux systems and even in Docker containers.
Key Features
- Mature project with a large, active community
- Extensive third-party blocklist ecosystem
- Clean web dashboard with query logging and statistics
- Supports custom whitelists and blacklists
- Works as a DHCP server (optional)
- Integrates well with Unbound for fully recursive DNS
Limitations
- Native encrypted DNS (DoH/DoT) support requires additional software (e.g., cloudflared)
- Setup can feel fragmented when adding upstream encrypted resolvers
- Interface, while functional, is less modern than AdGuard Home's
AdGuard Home
AdGuard Home is a newer entrant from the team behind the AdGuard browser extension and AdGuard DNS. It positions itself as a more feature-complete, all-in-one solution.
Key Features
- Built-in support for DoH, DoT, and DNSCrypt upstream resolvers — no extra tools needed
- Can itself act as a DoH/DoT server for client devices
- Modern, polished web UI with detailed per-client statistics
- Parental controls and safe browsing filters built in
- Per-client DNS settings (different rules for different devices)
- Single binary installation — simpler initial setup
Limitations
- Slightly smaller community than Pi-hole
- Fewer third-party integrations in the broader ecosystem
- Blocklist customization is slightly less granular than Pi-hole's
Feature Comparison
| Feature | Pi-hole | AdGuard Home |
|---|---|---|
| Network-wide blocking | ✅ | ✅ |
| Web dashboard | ✅ | ✅ (more modern) |
| Built-in DoH/DoT upstream | ❌ (needs cloudflared) | ✅ |
| Act as DoH/DoT server | ❌ | ✅ |
| Per-client rules | Limited | ✅ Full support |
| Parental controls | Manual blocklists | ✅ Built-in |
| DHCP server | ✅ | ✅ |
| Community size | Very large | Growing |
| Installation complexity | Moderate | Low |
Which Should You Choose?
Choose Pi-hole if:
- You want the most battle-tested solution with the largest community.
- You enjoy fine-grained control and don't mind installing a few extra components.
- You want deep integration with tools like Unbound for fully recursive DNS.
Choose AdGuard Home if:
- You want everything in one package — especially built-in encrypted DNS support.
- You need per-device DNS settings for a mixed household.
- You want a cleaner, more modern interface with less manual configuration.
The Good News
Both tools are free, run on modest hardware (a Raspberry Pi 4 handles either with ease), and provide significant improvements in privacy and browsing experience. You can even try both — they're easy to install and remove. For most home users starting out, AdGuard Home tends to be the smoother experience, while Pi-hole rewards those who want to go deeper.