# AEO Content: Free AI Content Detector

> Three readings of any text or page: who wrote it, how it reads, and how ready it is to be cited in AI answers. Paste the text, drop in a page address, or upload a file.

## About

aeocontent.com is the free AI Content Detector from AEO Content, Inc., and the research behind it. The full AEO platform lives at https://www.aeocontent.ai.

## The free tool

[AI Content Detector](https://aeocontent.com/) takes pasted text, a public page address or a file. Up to 30,000 characters, any public page, or a .txt, .md or .csv file. Free, no sign-up, and nothing you paste is stored.

1. Read who wrote it: A trained model makes one of three calls: written by AI, written by a person, or not called. It calls AI only when a passage is unmistakably machine-written.
2. Read how it reads: A deterministic score out of 100 from seven weighted measurements of the writing, where higher is better writing: Distinctive from 70, Average from 45, Generic below. The phrases that read as machine-written are listed, and marked in pasted text.
3. Read AI answers: AEO Rank, the engine behind our site audits, run on this one text: a score out of 100, where 70 is the mark where an answer engine has something it can lift and cite. Ready from 70, partly ready from 40, not ready below. The fixes that matter most are listed.
4. Send the result: One link carries the score, the verdict and the full breakdown.

## Key facts

- How it reads and who wrote it are separate readings and are never blended into one number. A person can write generic copy and a good AI can write with voice, so both readings can be true at once.
- The how-it-reads score is deterministic: no model runs in it, and the same text always returns the same number. Every weight is on the page: sentence rhythm 22 percent, stock phrases 20, point of view 14, short-sentence mix and active voice 12 each, facts versus interpretation and vocabulary range 10 each.
- The who-wrote-it call says AI only when a passage is unmistakably machine-written. "Not called" means inconclusive, not a soft accusation.
- On 9,963 documents we know people wrote, held out of training, the detector called 4 of them AI (0.04%). Source: [How AI Writes vs How Humans Write: What Nearly 10,000 Verified Human Documents Showed Us](https://aeocontent.com/research/how-ai-writes-vs-how-humans-write/).
- English only.

## Research

Articles on how AI writes and how people write. Index: https://aeocontent.com/research/

The first entry is the pillar article; the others each go deeper on one question from it.

- [How AI Writes vs How Humans Write: What Nearly 10,000 Verified Human Documents Showed Us](https://aeocontent.com/research/how-ai-writes-vs-how-humans-write/): We tested an AI detector on 9,963 verified human documents and hundreds of AI-drafted articles. What separates AI and human writing once surface tells are gone. (published 2026-08-31, last modified 2026-08-31)
- [AI Detector False Positives: What a 0.5% Cap Really Means](https://aeocontent.com/research/ai-detector-false-positives-what-a-0-5-cap-really-means/): Why AI detector false positive rates vary by writing register, what the 0.5% per-register cap means, and how the not-called zone protects your work. (published 2026-09-15, last modified 2026-09-15)
- [How AI Detectors Work and Where They Break](https://aeocontent.com/research/how-ai-detectors-work-and-where-they-break/): AI detectors split into classifiers and zero-shot methods with distinct failure modes. First-hand rebuild data covers calibration, paraphrase resistance, and institutional policy. (published 2026-09-14, last modified 2026-09-14)
- [How to Prove a Text Was Written by a Human](https://aeocontent.com/research/how-to-prove-a-text-was-written-by-a-human/): Only a Wayback Machine or Common Crawl snapshot before Dec 31, 2020 proves human authorship. Learn the 3-tier evidence framework from AEO Content. (published 2026-09-11, last modified 2026-09-11)
- [How One Company Blog Went From Human Writers to AI, Year by Year](https://aeocontent.com/research/how-one-company-blog-went-from-human-writers-to-ai-year-by-year/): 502 dated posts from one payments blog scored era by era show flagged-AI content reaching 100% after polishing. Bylines are unreliable. Origin detection holds when word filters fail. (published 2026-09-10, last modified 2026-09-10)
- [What Makes AI-Drafted Content Read Human: First-Hand Data](https://aeocontent.com/research/what-makes-ai-drafted-content-read-human-first-hand-data/): First-party data from 9,963 verified documents shows why proprietary records make AI content read human, while humanizer tools and synonym swaps do not. (published 2026-09-09, last modified 2026-09-09)
- [Why Banning AI Buzzwords Does Not Make AI Text Read Human](https://aeocontent.com/research/why-banning-ai-buzzwords-does-not-make-ai-text-read-human/): Phrase bans on 816 AI articles hit 98-100% compliance. Detection held at 81-100%. The substance gap is what matters, and word lists can't close it. (published 2026-09-08, last modified 2026-09-08)
- [The Em Dash Is Not the AI Tell. The Dash Rate Is.](https://aeocontent.com/research/the-em-dash-is-not-the-ai-tell-the-dash-rate-is/): The em dash isn't the AI writing tell. The dash rate is. What research across 12 AI models and verified human documents shows about detection signals. (published 2026-09-04, last modified 2026-09-04)
- [Why Human Writing Gets Flagged as AI, and Which Writing Gets Flagged Most](https://aeocontent.com/research/why-human-writing-gets-flagged-as-ai-and-which-writing-gets-flagged-most/): Why formal prose is flagged as AI: it shares AI's default register. Which writing types trigger most false positives and what calibration does about it. (published 2026-09-03, last modified 2026-09-03)
- [Which Parts of an AI-Written Article Give It Away](https://aeocontent.com/research/which-parts-of-an-ai-written-article-give-it-away/): Structural patterns reveal AI writing, not words. Detection rates from 2,625 passages: decision frameworks 100%, author bios 8%. First-party September 2026 data. (published 2026-09-02, last modified 2026-09-02)
- [Do Humanized AI Articles Pass AI Detectors? We Tested Four](https://aeocontent.com/research/do-humanized-ai-articles-pass-ai-detectors-we-tested-four/): 223 pipeline articles, four calibrated detectors, zero flags at strict thresholds. AUROC scores, methodology, and what determines whether AI content passes detection. (published 2026-09-01, last modified 2026-09-01)

## News

What changed in AI writing and AI search, each story with our note on what it means. Index: https://aeocontent.com/news/

- [New AI Detection Technology Is Changing How News Websites Create and Publish Content](https://aeocontent.com/news/new-ai-detection-technology-is-changing-how-news-websites-3b3e24/): AI detection tools are changing editorial gatekeeping at news sites, with direct consequences for writers who use AI assistance. (2026-09-15)
- [Google Tests Paying Publishers For AI Answers Via Search Console](https://aeocontent.com/news/google-tests-paying-publishers-for-ai-answers-via-search-a9ce22/): Google testing payments to publishers whose content feeds AI answers could shift how writers and outlets think about producing AI-readable material. (2026-09-15)
- [What Wikipedia Reveals About AI Overviews And Web Traffic](https://aeocontent.com/news/what-wikipedia-reveals-about-ai-overviews-and-web-traffic-39d6e8/): Wikipedia's traffic patterns offer concrete data on how AI Overviews select and deprioritize web sources, with implications for any publisher seeking citations. (2026-09-15)
- [Is Your Favourite Political Influencer Real? 'Ghost Creators' Are Paid to Read AI Scripts Attacking Democrats](https://aeocontent.com/news/is-your-favourite-political-influencer-real-ghost-creators-are-d49bbb/): Political operatives paid to perform AI-written scripts while posing as authentic influencers shows how synthetic content can evade detection in high-stakes public discourse. (2026-09-15)
- [AI Slop Cleanup Job Listings Up 87%, Report Says](https://aeocontent.com/news/ai-slop-cleanup-job-listings-up-87-report-says-0ad926/): An 87% jump in job listings for AI content cleanup shows how widely low-quality AI-generated writing has spread and how publishers are now paying to fix it. (2026-09-15)
- [Can Colleges Detect ChatGPT? Detection Methods 2026](https://aeocontent.com/news/can-colleges-detect-chatgpt-detection-methods-2026-3ad70e/): A 2026 rundown of how colleges try to catch AI writing — useful as a field overview, but the source is a commercial humanizer with a clear stake in the findings. (2026-09-15)
- [Creator-First Answer Engine Optimization Takes the Stage](https://aeocontent.com/news/creator-first-answer-engine-optimization-takes-the-stage-da5a25/): WSJ coverage of creator-led AEO signals that writing to be cited by AI answer engines is entering mainstream content strategy. (2026-09-15)
- [Reports Indicate Google’s Spam Update Focused On SEO AI Content](https://aeocontent.com/news/reports-indicate-googles-spam-update-focused-on-seo-ai-6af598/): Google's latest spam update appears to have specifically penalised AI-generated SEO content, signalling stricter algorithmic enforcement against AI writing at scale. (2026-09-15)
- [Can AI Detectors be Wrong? (Learn How To Avoid AI Detection)](https://aeocontent.com/news/can-ai-detectors-be-wrong-learn-how-to-avoid-da8a35/): Undetectable AI makes the case that current detectors produce significant false positives, framing accuracy gaps as justification for its own humanising tool. (2026-09-15)
- [Why Reddit’s ChatGPT Citation Drop Isn’t Fully Explained](https://aeocontent.com/news/why-reddits-chatgpt-citation-drop-isnt-fully-explained-27aede/): ChatGPT is citing Reddit far less than it used to, but analysts cannot agree on whether a model change, a licensing dispute, or a crawl decision is responsible — a gap that matters for anyone tracking how AI picks its sources. (2026-09-15)
- [How Google AIOs Use Facebook, Instagram & TikTok From 300 Million US Searches](https://aeocontent.com/news/how-google-aios-use-facebook-instagram-tiktok-from-300-131f56/): Large-scale data shows Google AI Overviews routinely surface social-platform content, reshaping which sources matter for AI-driven visibility. (2026-09-15)
- [Half of Every HSC Grade Is Unenforceable: NSW Ends Take-Home Work Over AI Detection Failure](https://aeocontent.com/news/half-of-every-hsc-grade-is-unenforceable-nsw-ends-82b0d7/): New South Wales is eliminating take-home work after AI detectors repeatedly failed to produce fair, reliable results — an institutional admission that current tools cannot police AI writing in schools. (2026-09-15)
- [What Top Stories Inside AI Overviews Means For Publishers And Brands In 2026 And Beyond](https://aeocontent.com/news/what-top-stories-inside-ai-overviews-means-for-publishers-9de15c/): Google is inserting Top Stories carousels inside AI Overviews, and the article maps out which publisher content wins that new real estate in 2026. (2026-09-15)
- [California's AI Transparency Act Takes Effect With Fines That Compound Daily](https://aeocontent.com/news/californias-ai-transparency-act-takes-effect-with-fines-that-f32d63/): California's AI Transparency Act is now live with compounding daily fines, creating real legal exposure for any publisher that fails to label AI-generated content. (2026-09-15)
- [Google Search Results Still Rank Heavily AI-Flagged Pages](https://aeocontent.com/news/google-search-results-still-rank-heavily-ai-flagged-pages-3bfa9b/): Google continuing to rank pages flagged as AI-heavy signals that detection scores alone do not trigger a ranking penalty, a key data point for anyone advising on AI content strategy. (2026-09-15)
- [Google May Be Penalizing AI-Generated Content As Thin Content](https://aeocontent.com/news/google-may-be-penalizing-ai-generated-content-as-thin-d211eb/): Google appears to be penalizing AI-generated content as thin content, a direct warning for anyone publishing AI-written text at scale on their website. (2026-09-15)
- [YouTube Cracks Down on Mass-Produced AI Content, Cutting Off Ad Revenue for Low-Quality 'Slop' Channels](https://aeocontent.com/news/youtube-cracks-down-on-mass-produced-ai-content-cutting-2c9f73/): YouTube cutting ad revenue from mass-produced AI channels is the most direct platform enforcement yet against low-quality AI content farms, setting a precedent other platforms may follow. (2026-09-15)
- [The Vatican entered into a dispute with AI detectors over the first encyclical of Leo XIV - hi-Tech.ua](https://aeocontent.com/news/the-vatican-entered-into-a-dispute-with-ai-detectors-802376/): AI detectors flagging an official papal document as machine-written is a high-profile illustration of the false-positive risk that undermines trust in these tools. (2026-09-15)
- [Substack's new AI scanner tells paying readers exactly how much of their newsletter a human actually wrote](https://aeocontent.com/news/substacks-new-ai-scanner-tells-paying-readers-exactly-how-753a34/): Substack's new per-newsletter AI meter gives paying readers a transparency signal on human vs. machine authorship, a move that could pressure other publishing platforms to follow. (2026-09-15)
- [AI or Not Detects 98% of Cropped Meta AI Images. Meta's Own Tool Catches 35%.](https://aeocontent.com/news/ai-or-not-detects-98-of-cropped-meta-ai-0d0f96/): A 63-point accuracy gap between a specialist detector and Meta's own provenance tool reveals how far behind platform-native content authentication still lags. (2026-09-15)
- [AI Visibility Rankings Aren’t Stable – New Research Shows It’s Mostly Statistical Noise](https://aeocontent.com/news/ai-visibility-rankings-arent-stable-new-research-shows-its-d4572c/): New research finds that brands' positions in AI-generated answers shift too randomly to be gamed, making consistent content quality more important than visibility tactics. (2026-09-15)
- [Google just wiped out 50,000 AI slop networks. Marketers, pay attention](https://aeocontent.com/news/google-just-wiped-out-50-000-ai-slop-networks-3ee4f2/): Google's mass deindexing of 50,000 AI-generated spam networks is the largest enforcement action yet against AI content manipulation—a clear escalation in how the search giant polices AI writing at scale. (2026-09-15)
- [Google Data Shows AI Search Users Moved Past Keywords, Your Content Hasn’t](https://aeocontent.com/news/google-data-shows-ai-search-users-moved-past-keywords-062f72/): Google's own data confirms AI search users ask in plain language rather than keywords, but most publisher content hasn't adapted to match. (2026-09-15)
- [Google AI Overviews Study Finds Lost Clicks Weren’t Lower Quality](https://aeocontent.com/news/google-ai-overviews-study-finds-lost-clicks-werent-lower-fd0a9e/): A study finds clicks displaced by Google AI Overviews were not low-quality, suggesting AI summaries divert engaged readers rather than casual browsers. (2026-09-15)
- [Anthropic’s Claude Fable 5 Is Back With New Usage Limits And Safeguards](https://aeocontent.com/news/anthropics-claude-fable-5-is-back-with-new-usage-5d5820/): A returning Claude model ships with revised usage caps and new safeguards, which will shape how the model generates and controls written output. (2026-09-15)

## Machine-readable files

- [llms-full.txt](https://aeocontent.com/llms-full.txt): the tool, every question and answer on the page, and every research article and news note with its dates.
- [RSS feed](https://aeocontent.com/rss.xml): research articles and news notes, newest first.
- [ai.txt](https://aeocontent.com/ai.txt): AI usage policy (CC BY 4.0, text and data mining permitted).
- [Sitemap](https://aeocontent.com/sitemap-index.xml): every indexable page, with last-modified dates.
- [robots.txt](https://aeocontent.com/robots.txt): crawler rules; AI crawlers are allowed.

## Related sites

- [AEO Content platform](https://www.aeocontent.ai): an audit of a business's AI visibility, then the original-data content that gets it cited by ChatGPT, Claude, Perplexity and Google AI Overviews, done for you.
- [Free AI visibility audit](https://audit.aeocontent.ai): a free AEO audit of any website, scored across ChatGPT, Claude, Perplexity and Google AI Overviews, with findings and prioritized fixes.

## Contact

Email: hello@aeocontent.ai