Free tool · content score
Score a page or a draft for search and AI answers.
This SEO content checker scores a page or a draft from 0 to 100 on whether search engines will rank it and AI answers will quote it, and names the sentence behind every lost point with its fix. It runs `heddle score`, built from the rules Heddle's gates use, in your browser. Here it reads three of five parts, so a high score is a good sign, not a pass.
Enter a page's address, or paste a draft, to score it and see each sentence that costs it points.
How the tool decides
Five parts make the score, each weighed by what it costs a page. Helpful content counts 30 points and sounding like a person 20. An answer an engine can quote is worth 20, sources a reader can check 15, and search basics such as the title, the description and one H1 another 15. Each finding takes off a fixed amount, more for one that sinks the page than for one bad sentence.
AI detectors and this checker
GPTZero and tools like it estimate whether a machine wrote the text. Google says it rewards quality "however it is produced" (Google Search Central, February 2023), so this checker asks something else. Will a reader, Google and an answer engine find the page worth using, and which sentence would change that?
It reads one page. It doesn't crawl the rest of the site, follow links, time the page or look up where it ranks.
Why two parts say SKIPPED
Whether the opening answers the search, and how the page does on Google's helpful-content questions, are judged by a language model, and this page runs none. Rather than guess, it leaves them out and says so. The total is made of the three parts that ran.
Under 50 words of visible prose, there's no score at all. An article may open on a story when its description answers the search, while a landing page has to answer in its opening.
On a site Heddle runs, the agents read the skipped parts with a model on every draft before it publishes, and heddle score does the same from a terminal. The rules are the ones listed under the checks.
Sources
- developers.google.com/search/docs/fundamentals/creating-helpful-content
- developers.google.com/search/blog/2023/02/google-search-and-ai-content
- developers.google.com/search/docs/appearance/title-link
- developers.google.com/search/docs/appearance/snippet
- developers.google.com/search/docs/appearance/ai-features
Each was read on October 18, 2026.
Questions
Does anything I paste get stored?
No. The score is worked out in your browser. To check a live page, our server fetches that one page from the address you give and passes its HTML back; it keeps nothing and logs nothing about the page.
Is this an AI content detector?
No. It never says whether a person or a model wrote the page. It flags the phrasing readers take for machine writing, because that costs trust whoever wrote it, and it scores the rest on what search and answer engines reward.
Why does a page I can see score as empty?
When a page draws its text with JavaScript, the HTML our server fetches has almost no words in it. Under 50 words of visible prose gets no score. A crawler that runs no JavaScript sees the same empty page, so it is worth fixing.
Have the agents fix it before it ships.
Check your site, talk to us, or see the plans.
On a site Heddle runs, these rules are gates. The writing agents repair what they catch before a draft publishes, with the model reading the parts this page skips, and the build fails a page that still misses them. Tell us about your site and we'll show you what they would catch.