uBlock Origin is the best ad blocker ever built - for the web it was designed for. For AI platform ad formats (sponsored responses, injected citations, conversational product placements), it blocks an average of 31% across 10 platforms. AdNeutral, purpose-built for this problem, blocks 98%. The recommendation: run both. They solve different problems.
Why uBlock Origin Falls Short on AI Platforms
Let's be precise about what uBlock Origin is and isn't. It is the most sophisticated general-purpose ad blocker available. Its filter matching engine is faster than any alternative. Its community-maintained filter lists (EasyList, uBO filters) cover millions of known ad selectors and network patterns. For traditional web advertising, it is simply the best tool.
The problem is architectural. uBlock Origin was designed to block two categories of content: network requests to known ad servers, and DOM elements that match known CSS selectors. Both approaches depend on the ad content being structurally distinct from the surrounding page.
AI platform ad formats break both assumptions:
- Network requests: ChatGPT sponsored responses are served from
api.openai.com/v1/chat/completions- the same endpoint as every legitimate message. There is no separate request to block. - CSS selectors: AI platform class names are hashed and rotated
regularly (e.g.
sc-bczRLJthis week,sc-hKwDyenext week). Static filter lists can't keep up.
The uBlock Origin team builds for the web that exists. AI platform ads are a new problem that emerged after uBlock's architecture was established. The tool is doing exactly what it was designed to do - the design just predates this problem.
Test Methodology
We ran 2,400 test queries across 10 AI platforms in March 2025, using a fresh Chrome profile with each extension installed separately. Queries were designed to trigger commercial intent responses - product recommendations, service comparisons, and purchase decisions - the scenarios most likely to return sponsored content.
For each query we recorded:
- Whether a sponsored/promoted response was present in the raw page source
- Whether the extension's rules removed it from the rendered page
- Whether any false positives (legitimate content removed) occurred
uBlock Origin was tested with its default filter lists plus the full uBO filter set. We did not use custom rules - this reflects how most users run it.
Platform-by-Platform Test Results
| Platform | AdNeutral | uBlock Origin | Primary Gap |
|---|---|---|---|
| ChatGPT | 99% | 22% | Sponsored responses served from main API endpoint |
| Google Gemini | 98% | 41% | Shopping panels use Google's first-party ad infra |
| Perplexity | 97% | 48% | Sponsored citations indistinguishable at network level |
| Microsoft Copilot | 99% | 53% | Copilot reuses Bing ad elements - partially visible to uBO |
| Claude | 98% | 12% | Upsell banners use React-generated class names with no pattern |
| You.com | 97% | 29% | Sponsored results rendered inside React shadow components |
| Meta AI | 96% | 19% | Ads embedded in Facebook's first-party component system |
| Character.AI | 98% | 8% | Subscription upsell uses in-conversation injection |
| Poe | 98% | 17% | Bot promotion ads use same component as regular bot listings |
| Grok (xAI) | 97% | 15% | Sponsored responses embedded in X.com's component tree |
| Average across all 10 | 98% | 31% |
Test methodology: 240 commercial-intent queries per platform, Chrome 122, fresh profiles, default filter lists for uBlock Origin, v1.4.0 rules for AdNeutral. Full data available on GitHub.
Feature Comparison
| Feature | AdNeutral | uBlock Origin |
|---|---|---|
| AI Platform Coverage | ||
| AI sponsored response blocking | Partial | |
| Conversational ad injection blocking | ||
| AI affiliate link stripping | ||
| Dedicated AI platform rules (2,400+) | ||
| Rules updated <1 hour (Pro) when AI platforms change | ||
| General Web Advertising | ||
| Traditional web banner ads | Basic | Excellent |
| Video pre-roll ads (YouTube etc.) | ||
| Third-party tracking scripts | AI trackers only | Comprehensive |
| Network-level ad request blocking | AI endpoints | Comprehensive |
| Community filter list ecosystem | Large ecosystem | |
| Extension | ||
| Free to use | ||
| Open source | ||
| Chrome & Firefox | ||
| Zero performance impact | ||
| Cross-device sync | Pro only | |
Which Should You Use?
They are not competitors. uBlock Origin handles the web. AdNeutral handles AI platforms. Install both and you have comprehensive coverage across all of your browsing.
Use uBlock Origin when: you want to block ads across the broader web - news sites, YouTube pre-rolls, tracking scripts, and ad network requests on every site you visit. It is the gold standard for this and nothing comes close.
Use AdNeutral when: you use AI platforms like ChatGPT, Gemini, Perplexity, or Copilot and want to block the sponsored responses, injected product recommendations, tracking pixels, and upsell popups that are unique to these interfaces.
Use both when: you want ad-free browsing everywhere. They don't conflict. Running both adds no measurable latency. This is what our team does.
Frequently Asked Questions
Does uBlock Origin block ChatGPT ads?
Partially. uBlock Origin's default filter lists block some ChatGPT ad network requests, but ChatGPT's sponsored responses use conversational injection - served from the same API endpoint as legitimate responses - which uBlock's network rules cannot target. In our tests, uBlock blocked 22% of ChatGPT ad formats. AdNeutral blocked 99%.
Can I use AdNeutral and uBlock Origin together?
Yes, they work well together. uBlock Origin excels at blocking traditional web ads, trackers, and ad network requests. AdNeutral is purpose-built for AI platform ad formats. Running both gives you comprehensive coverage across all web browsing and all AI platforms.
Why doesn't uBlock Origin block AI sponsored responses?
uBlock Origin works by blocking network requests to known ad servers and hiding elements that match static CSS selectors in its filter lists. AI sponsored responses are served from the same API endpoint as regular chat responses - there's no separate network request to block. The ad content is injected into the page using obfuscated, regularly-rotating class names that don't match uBlock's static lists.
Is AdNeutral a replacement for uBlock Origin?
No. They solve different problems. uBlock Origin is the best tool for blocking traditional web advertising, tracking scripts, and ad network requests across the whole web. AdNeutral is purpose-built for AI platform ad formats that uBlock wasn't designed to handle. We recommend running both.
Will uBlock Origin ever support AI platform ads natively?
Possibly, over time. uBlock Origin's community filter lists could theoretically be extended to cover AI platform ad patterns. But the core architectural challenge - blocking content served from first-party endpoints using rotating identifiers - requires a different approach than uBlock was built for. It would require significant changes to its filter matching engine, not just adding new rules.