NovaBlock vs uBlock Origin

If you are reading this, you have probably narrowed your 2026 ad blocker shortlist to two names: NovaBlock and uBlock Origin (specifically uBlock Origin Lite, the Manifest V3 version that ships in the Chrome Web Store today). Both are excellent. They are also built for different people. This comparison is meant to be the one you wish existed when you started searching, written by people who use both daily and have nothing to gain from misleading you.

For context on how the broader landscape looks, see our best ad blocker 2026 guide. For the underlying technology, the how ad blockers work explainer is a good companion.

TL;DR

If you want a focused, open-source, no-business-model blocker that does the core job extremely well and asks nothing of you, install uBlock Origin Lite. If you want a single extension that handles ads, trackers, cookie banners, pop-ups and YouTube reliably across devices with no configuration, install NovaBlock.

Both are good choices. There is no wrong answer here.

A bit of history

uBlock Origin was created by Raymond Hill in 2014 as a fork of an earlier project, and quickly became the gold standard for content blocking. It is famous for being lean, accurate, and refusing to monetise. When Manifest V3 was announced, Hill made his disagreements public, but ultimately shipped uBlock Origin Lite as the MV3-compatible successor.

NovaBlock was built in 2024 with one goal: a Manifest V3 ad blocker that does not feel like a downgrade. The team did not have a legacy codebase to drag along, so the engine, the YouTube module, the cookie banner module and the multi-device sync were all designed against MV3's constraints from day one.

Engine and performance

Under Manifest V3, both blockers convert filter lists into declarative network rules that the browser itself enforces. This is faster than the old approach because the browser evaluates the rules natively in C++, not in extension JavaScript.

In our 2026 benchmarks on a clean Chrome 132 profile:

The gap on YouTube and cookie banners is not a fluke. It is a product decision. uBO Lite intentionally stays out of the "every banner on every site" cosmetic arms race because that is not what its author wants to maintain. NovaBlock leans into it because that is what most consumers actually want.

Features compared

Ad blocking core

Both ship the standard EasyList and EasyPrivacy filter sets. Both let you add custom lists. Both block first-party and third-party requests using the same declarativeNetRequest API.

Verdict: tie. The differences here are negligible for normal users.

YouTube ads

NovaBlock has a dedicated YouTube module that is updated independently of the main filter lists, sometimes multiple times per week, to keep up with YouTube's anti-blocker changes. Our block YouTube ads guide goes into the technical reasons this is hard.

uBO Lite blocks the easy YouTube ads via filter lists but does not do specific YouTube engineering. When YouTube ships a new anti-blocker wave, uBO Lite typically catches up within a few weeks via community-submitted filters; NovaBlock catches up within days.

Verdict: NovaBlock wins on YouTube.

Cookie banners

NovaBlock auto-dismisses cookie banners across thousands of sites, defaulting to "reject all" wherever the choice exists. Our cookie banner deep dive explains how that works without breaking sites.

uBO Lite can suppress banners if you enable the AdGuard Annoyances filter list manually. It is not on by default and the suppression rate is lower.

Verdict: NovaBlock wins on cookie banners.

Pop-ups and pop-unders

Both block the standard variants well. NovaBlock has slightly broader coverage of newer pop-under patterns because of its dedicated annoyances list. See block pop-ups.

Verdict: NovaBlock edges ahead, marginally.

Tracker blocking

Both ship EasyPrivacy and similar lists. NovaBlock additionally maintains a small in-house list focused on newer tracking SDKs that have not yet been picked up by the community lists. See block trackers.

Verdict: NovaBlock by a hair.

Multi-device sync

NovaBlock Premium syncs your Premium status across browsers and devices via a single account. See the account page.

uBO Lite has no sync because it has no account. Your filter list choices live in browser sync if you use Chrome sync.

Verdict: depends on your needs. If you have multiple devices, NovaBlock. If you live on one machine and use Chrome sync, the difference does not matter.

Configurability

uBO Lite has a "trust level" model with three settings (basic, optimal, complete). Beyond that there is intentionally not much to configure, because under MV3 the original uBO's dynamic filtering is not possible.

NovaBlock exposes a similar simple model with per-site toggles, plus a few high-level switches for cookie banners, YouTube and trackers. There is no power-user "Logger" view.

Verdict: tie for most users. Power users who miss the original uBO's element picker and logger will not find them in either MV3-era blocker.

Privacy

This is where the two products are most aligned.

• Neither sends browsing history anywhere.
• Neither has third-party analytics in the extension.
• Both are auditable: uBO Lite via its GitHub repository, NovaBlock via its privacy policy and the fact that the extension itself is bundled and inspectable from your browser's developer tools.

Where they differ is the business model around the extension.

• uBO Lite has no business model. The lead developer accepts donations but does not run a company.
• NovaBlock has a freemium model with a paid Premium tier. The free tier is fully functional and does not contain ads, telemetry or "acceptable ads".

Neither is more "private" than the other in any meaningful sense. They are different sustainability models.

Site breakage and recovery

Both blockers break sites occasionally. The recovery experience is similar: one click in the toolbar to pause for a domain, and the page reloads working.

NovaBlock additionally includes a "report broken site" link that submits the domain to our filter team. uBO Lite users typically report breakage on the issue tracker.

Pros and cons

NovaBlock pros

• Best-in-class YouTube ad blocking out of the box.
• Cookie banner removal on by default.
• Multi-device Premium sync.
• Friendly UI, no configuration ritual.
• No in-product telemetry.

NovaBlock cons

• Closed source for now, though we are working on opening parts of the engine.
• Premium subscription if you want advanced YouTube and multi-device sync.

uBlock Origin Lite pros

• Fully open source.
• No business model, no upsell, no account.
• Tiny memory footprint.
• Trusted by the privacy community for over a decade.

uBlock Origin Lite cons

• YouTube and cookie banner coverage trails NovaBlock by default.
• Sparse UI can feel intimidating for non-technical users.
• No multi-device sync.
• Power-user features from the original uBlock Origin are not present in the Lite (MV3) version.

Real-world scenarios

• Parent setting up a family laptop: NovaBlock. The defaults are right, and you will not be asked to reconfigure anything.
• Open-source developer who lives in the terminal: uBO Lite. You will appreciate the minimalism.
• Heavy YouTube watcher: NovaBlock. The YouTube module is meaningfully better.
• Privacy researcher writing about blockers: install both in separate profiles and read the source. You already know what to do.
• EU user drowning in cookie banners: NovaBlock. The banner suppression is on by default and works on thousands of sites.

Conclusion

NovaBlock and uBlock Origin Lite are both excellent in 2026. uBO Lite is the disciplined open-source classic, refined for MV3, with no business model and no marketing. NovaBlock is the polished consumer product, built for MV3 from scratch, that bundles the things most people actually want, YouTube, cookie banners, sync, into one extension.

If you are already happy on uBO Lite, you have no urgent reason to switch. If you are tired of configuring blockers and you want one that just works on every site, NovaBlock is the easier recommendation. Install it from the Chrome Web Store or Firefox Add-ons, and check Pricing if you want Premium.