What are the best open source alternatives to AdGuard?

The top open source alternatives to AdGuard include Zen. These tools offer similar functionality while being free and open source.

Why choose an open source alternative to AdGuard?

Open source alternatives provide transparency, community support, no vendor lock-in, and often cost savings. You can customize the software to your needs and have full control over your data.

Are these AdGuard alternatives really free?

Yes, all listed alternatives are open source and free to use. You may need to pay for hosting if you self-host, but the software itself is free.

1 Best Open Source AdGuard Alternatives in 2026

Free, open-source desktop app that blocks ads, trackers, and surveillance scripts across all browsers and apps on Windows, macOS, and Linux.

Zen is a desktop privacy tool that blocks ads and trackers at the network level, covering every browser and most desktop apps at once. Unlike browser extensions, it doesn't stop at your browser tab. It intercepts traffic system-wide, so background tracking in apps, embedded web content, and non-browser software gets caught too.

It's a direct alternative to tools like AdGuard for users who want one install to replace a stack of extensions, hosts file edits, and manual configurations.

What it blocks:

Ads across browsers, including YouTube video ads and Spotify audio ads
Trackers and surveillance scripts from sites, apps, and background processes
Fingerprinting attempts and profiling infrastructure
Cookie banners and data broker requests

Zen operates at the HTTP(S) level, not just DNS. That distinction matters. DNS-level blockers work by refusing to resolve entire domains, which means they can't separate ads from legitimate content served from the same address. Zen inspects individual requests, so filtering is more precise and false positives are rarer.

A local root certificate handles HTTPS filtering. It's generated on your device and never transmitted anywhere. All processing stays local, nothing is sent to external servers.

The defaults work for most people. Pre-configured filter lists cover ads, trackers, and malware out of the box, with regional lists available. You can add custom lists or write your own rules if needed. Zen supports all popular filter list formats.

Real-time visibility is built in. You can see every blocked request, where it originated, and why it was stopped. That kind of transparency is rare in privacy tools aimed at general users.

It works with Chrome, Firefox, Brave, Safari, Edge, and Opera, plus desktop apps that use system network settings. Some apps with custom networking or strict certificate pinning may bypass it. On Linux, automatic proxy configuration is supported on GNOME and KDE environments.

Free, open source, and already past 70,000 downloads.