How Much of Your Content Is AI-Written?

How This AI Detector Works (Without a Paid AI Model)

Most detectors send your text to a server, run it through a black-box model, and hand back a number you have to take on faith. This tool takes the opposite approach. It checks your writing against the stylistic patterns that researchers and Wikipedia's editor community have documented across thousands of confirmed AI-generated texts, then shows you exactly which ones it found and where.

The signals fall into three groups:

Each signal carries a weight based on how strongly it correlates with AI output, and the weighted results combine into your 0–100 score. A worked example: a 500-word blog post with eight em-dashes, four "delve/seamless/pivotal"-type words, two "not just X, but Y" reframes, and sentences that all sit between 16 and 22 words will land around 70 — likely AI — and every one of those triggers will be marked in yellow so you can see the case against it.

Because everything runs in plain JavaScript on your own device, there is no server cost — which is why this stays free forever, with no caps. It also means the checker keeps working even if your connection drops after the page loads.

Detects Text From ChatGPT, Gemini, Claude, and Every Major AI Writer

You don't need a different detector for each chatbot. The tells this tool measures — em-dash overuse, AI vocabulary, "not X but Y" reframes, flat sentence rhythm — come from how large language models are trained, and every major model picked up the same habits. Output from any of these scores accurately here:

Two things worth knowing. First, no detector can tell you which model wrote a text — the styles overlap too much — so this tool reports how AI-like the writing is, not the brand behind it. Second, newer models are slowly getting better at hiding some tells, which is why the score leans on rhythm and structure, not vocabulary alone. Humanized or paraphrased AI text lands in the mixed band more often than the clean bands, and that's the honest answer, not a bug.

Free AI Detector vs Paid Detectors: What You Actually Give Up

Short answer: less than the pricing pages suggest. Paid detectors run trained classifiers, which helps on some edge cases, but the day-to-day experience for a writer checking drafts looks like this:

The transparency point matters more than it looks. A bare percentage tells you nothing about what to fix. A highlighted sentence does. If your goal is improving your own writing rather than policing someone else's, the evidence view is the feature you'll actually use — and it's the one most paid tools don't offer.

Reading Your AI Score

• 0–40 · Likely human. Few or no AI tells. Natural rhythm, varied vocabulary.
• 40–65 · Mixed signals. Common for AI drafts that got a human edit, or for humans who write in a very polished corporate register. Check the highlights before judging.
• 65–100 · Likely AI. Multiple strong tells firing together. Text at this level usually reads as unedited chatbot output.

An honest note on accuracy: no AI detector on the market — free or paid — is 100% reliable, and anyone claiming otherwise is selling you something. Short texts, heavily edited AI drafts, and non-native English writing can all confuse detectors, including this one. Treat the score as a screening signal and read the highlighted evidence yourself. Never punish a student or writer on a detector score alone.

What an AI Detector Can and Can't Do

It can flag unedited chatbot output with high confidence, because unedited output is saturated with tells. It can show a writer exactly which habits make their text read as machine-written, which makes it a genuinely useful editing instrument. And it can screen large volumes of submitted content fast, surfacing the pieces worth a human look.

It cannot prove authorship. It cannot tell ChatGPT from Gemini. It cannot reliably judge a two-sentence paragraph, a poem, or code. And it will sometimes flag humans — especially non-native English speakers and people trained to write in formal corporate style, since that register overlaps heavily with what chatbots learned from. That's why the mixed band exists and why we show evidence instead of just a verdict.

One more distinction people mix up: an AI detector is not a plagiarism checker. A plagiarism checker compares your text against published sources to find copying. An AI detector estimates whether text was machine-written — even if it's completely original. A ChatGPT essay usually passes plagiarism checks (it's technically "original" text) while failing AI detection, and a copied human paragraph does the reverse. If you need both answers, you need both tools.

Who Uses an AI Content Checker?

Bloggers and SEO teams check drafts before publishing, since heavily AI-flavored content risks underperforming in search — Google's guidance targets low-value content regardless of how it was made, and unedited AI text tends to be exactly that. Editors and agencies screen freelancer submissions before paying for them. Students check their own essays before handing them in, because teachers run the same kinds of checks and it's better to find a false positive yourself than to argue about one later. Publishers and newsletter writers spot-check guest posts.

Writers who use AI as a drafting tool get the most value of all. For them the score isn't a judgment, it's a progress bar: draft with AI, run the check, rewrite the highlighted sentences in your own voice, run it again. The highlighted evidence works as an editing checklist, and our guide on how to humanize AI content walks through the fixes pattern by pattern. If you'd rather understand the theory first, start with the 12 signs of AI writing.

AIScorely in Numbers

Show Readers Your Content Is Human-Checked

Readers are getting suspicious of everything they read, and "is this AI?" is now a real objection. If your work passes the check, say so. Paste this badge at the bottom of your posts — it links back here so your readers can verify with the same free tool:

<a href="https://aiscorely.com/?ref=badge" title="Checked with AIScorely — free AI detector">
  <img src="https://aiscorely.com/badge.svg" alt="Human-checked with AIScorely" width="216" height="44">
</a>

It works anywhere HTML works: WordPress, Blogger, Ghost, Substack (via the HTML block), Medium bios, and portfolio sites. No tracking, no scripts — it's a plain image and a link.

Go Deeper: Our AI Detection Guides

Everything on this site is free to read, built from the same research the detector runs on. Start with the 12 signs of AI writing to understand what the highlights mean, then how to humanize AI content to fix them. Students should read how Turnitin's AI detection really works before their next submission. Comparing tools? We keep an honest roundup of the best free AI checkers, plus straight-talking alternative guides for Winston AI and Grammarly's detector. And for the question we hear most after text: how to check if an image is AI-generated.