Domain-level filtering
Known ad, tracking and malicious domains resolve to a local block response before the request reaches its destination.
Core capabilityLocal-first protection for Mac ·
Windows · iOS · Android
Stop ads at the root. Reclaim your Zen.
ZenDefend filters known ad, tracker and malicious domains before they reach your browser or desktop apps, with a clear boundary around what DNS-level protection can and cannot do.
System-level domain filteringLocal-first by designMac
and Windows desktop beta
ZenDefend ProtectionProtected
Today’s filtering
1,284 blocked requests
Last 24 hours · local statistics
74%
×ads.example.netAd domain
×tracker.example.comTracker
✓docs.example.comAllowed
The local engine evaluates the domain policy. The dashboard explains the rule match without uploading raw browsing URLs by default.
One product. One clear promise.
Protection below the browser extension.
ZenDefend is built for the requests that browsers, desktop apps and connected devices make before a page is rendered.
Custom controls
Use standard lists, allow rules and custom domain mappings for the services you actually need.
Clear and reversibleExplainable logs
See which rule matched and restore a legitimate domain without sacrificing the rest of your protection.
Local-first diagnosticsCapability boundary
A real blocker earns trust by telling you where it stops.
DNS filtering is powerful across browsers and apps, but it cannot reliably separate advertising from content delivered by the same domain or stream.
Scenario
ZenDefend Ad Blocker
What you may still need
Known ad and tracker domains
System-wide blocking
—
Multiple browsers and desktop apps
Covered by one domain policy
—
Page cosmetic cleanup
Limited at DNS layer
Browser content blocker
Same-domain or in-stream ads
Not reliably separable
Content-aware filtering
Built for recovery
No bad rule should take your internet hostage.
ZenDefend validates new rules, swaps policies atomically and keeps a last-known-good configuration when an update fails.
Intercept
The local engine receives domain queries and evaluates the active rule set.
Explain
Filtering logs show the matched rule and provide a direct allow-list path.
Recover
Subscription or sync errors fail open instead of silently breaking the user’s network.
Start with the Ad Blocker
One product for the first release. Choose the device coverage and support level that fits your setup.
See Ad Blocker plansNeed help before purchase?
Ask about compatibility, DNS behavior, certificates, licenses or the current release channel.
Contact support