Most Accurate AI Detector

Is Originality.ai free, or is there a free Originality trial? There is not currently a free trial of Originality.ai. As an alternative, we offer a free AI content detection tool (a limited free version of our industry-leading AI Checker) on this page. Try the AI copy detector and check if something was written by AI, before reviewing our flexible pricing options. Have a question? Reach our exceptional support team here.

Yes, Originality.ai offers an industry-leading AI detector for identifying AI-generated and AI paraphrased content. 

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Our detector has been trained to detect if content has been paraphrased with a tool like Quillbot or humanized with a popular AI humanizer (see our accuracy study for insights into AI detection on popular AI humanizers).

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If a piece of text, regardless of whether it started as AI or Human, is run through a paraphrasing tool like Quillbot, Originality.ai will identify the content as AI-generated 95% of the time. 

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Read more about Paraphrase Plagiarism Checker

False positives do occur and can be painful. At Originality.ai, based on our accuracy study, our Lite model has a 0.5% false positive rate, our Turbo model has a 1.5% false positive rate, and our Academic model has a <1% false positive rate.

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The AI researchers and machine learning engineers at Originality are working constantly to both improve detection accuracy and reduce false positives. 

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We are heavily focused on equipping writers with tools to help them prove their content’s Originality, which is why we developed a free Chrome Extension that allows anyone to visualize the creation process of a Google Doc. Watch our Chrome Extension tutorial!

False positives in AI detection do occur, and false positive rates can vary widely by AI detection tool and brand. When choosing an AI detector, it is essential to check not only the tool’s accuracy rate but its false positive rate as well.

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7 tips to reduce false positives:

1. An AI detection score of 60% Original and 40% AI is not a false positive. It correctly predicted with 60% confidence that your content was Original. The AI confidence score means it is 60% confident that the content is Original (not that 60% of the text was Original and 40% was AI).
2. Editing AI-written content is not a false positive - it is a true positive.
3. Having AI edit your work is not a false positive - it is a true positive.
4. Be mindful that when AI changes the content (such as with some Grammarly features), it can cause the entire article to be flagged as AI.
5. Avoid “Cyborg” writing, which uses several AI tools to create an outline, suggest edits, and optimize the content. This can increase the chance of a higher AI score. Instead, to leverage predictive SEO for human-written content, use our content optimizer, similar to SurferSEO or MarketMuse.
6. Avoid strange formatting, which can reduce the accuracy of detector tools, causing an increase in false positives or false negatives. Not to mention that readers prefer well-structured and consistently formatted, readable content.
7. The shorter the text, the less accurate the detection score; we recommend 100 words (minimum). 

Have a question about our AI detector? Our exceptional support team is here to help.

See our in-depth guide on avoiding and managing AI detector false positives (when human-written content is identified as AI-written text by an AI detector). 

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Students: Share resources on AI detection accuracy with your teacher or professor, then demonstrate your creation or writing process with our free Chrome Extension. An AI detection score alone should not be used for academic integrity discipline. 

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Writers: Write content in a Google Doc and share the free Originality.ai Chrome Extension with clients. That way, if there is a false positive, you can prove you created the document. Share how we recommend people use the AI detection score. AI detection is not the same as plagiarism checking and should have a more nuanced approach to what is and is not acceptable.    

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Agencies: The first thing any content agency needs to do is define:

• Is AI acceptable?
• If it is acceptable, to what extent can AI tools be used?
• If it’s not acceptable, what is the approach to content review?
• How will AI guidelines be communicated to clients?

It’s best practice to get everyone on the same page about AI use right from the start. Get tips on how to incorporate AI guidelines into freelance writing contracts in our guide. 

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If you have clients who accuse your agency of producing AI content rather than human, refer to your company's policy/procedure for checking work and show the scan history of the writer's work.

Wondering “what is the best AI checker?” or “what is the most accurate AI detector?” Originality.ai is the most accurate AI content detector, producing the fewest false positives while also being an industry-leader in accurately identifying a piece of content (human or AI) that has been paraphrased. 

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Several third-party studies have also evaluated Originality.ai’s accuracy; check out a meta-analysis of studies.

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At Originality.ai, we offer a full suite of patented content quality tools, alongside the Originality AI detector, including the best plagiarism checker AI tool, readability, fact-checking, and SEO.

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To compare the best AI detectors, check out our guide with reviews on the best AI detection tools.

We’ve seen the question pop up a few times: “Can colleges tell if you use AI?” Originality.ai is one of the top AI detectors used by colleges and universities for research. Learn more about which AI checkers colleges use to check if writing is AI.

Are you wondering, “Which AI detector is most accurate?” When we tested the Originality AI Checker on the latest AI models, Originality.ai Lite demonstrated 99% accuracy, and Originality.ai Turbo demonstrated 99%+ accuracy.

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To see a comparison of accuracy rates, please visit our Accuracy Study.

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Then, read a meta-analysis of 3rd-party studies, get insight into what false positives are (and how to avoid them), and find out which AI detection model is best for you (Lite, Academic, Turbo, or Multilingual).

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We've included an image below from our testing on GPT-4, a previous OpenAI model. It's what's known as a “confusion matrix” that is used to assess the accuracy of an AI prediction machine. 

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Each prediction our AI makes on a test dataset is grouped into one of four buckets:

• True Positive: AI detector correctly identified AI content as AI
• False Negative: AI detector incorrectly identified AI content as Human
• False Positive: AI detector incorrectly identified Human content as AI
• True Negative: AI detector correctly identified Human content as Human

The image below shows a previous confusion matrix for Originality tested on GPT-4-generated content (for the latest confusion matrix based on our new models, see our Accuracy Study).

AI-generated text is text (words) that is written by artificial intelligence (AI), specifically using Large Language Models (LLMs). 

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The most common example is OpenAI’s ChatGPT, which is an AI using OpenAI’s NLP Models (GPT-3, GPT-3.5, GPT-5) to understand a user's prompt and provide a written response.

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For the purposes of AI text detection, we aim to flag any content that has been meaningfully changed by AI. 

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We try to take an approach that is consistent when defining What is Plagiarism “presenting work or ideas from another source as your own,” when training our AI detection model and running an AI writer check. 

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Slight editing with Grammarly or similar is NOT considered AI-generated. 

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Here is what we think should and should not be classified as AI-generated content:

• AI-Generated and Not Edited = AI-Generated Text
• AI-Generated and Human Edited = AI-Generated Text
• Human Written and Heavily AI Edited = AI-Generated Text
• AI Outline*, Human Written, and Heavily AI Edited = AI-Generated Text
• Human Written and Lightly Edited with AI (~5% change) = Original Human-Generated
• AI Research and Human Written = Original Human-Generated
• Human Written and Human Edited = Original Human-Generated

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*AI Outline is defined as using AI (an LLM) to create a content idea, do some research, and/or create an outline. The level at which AI is used during this process may vary and could potentially affect the likelihood the text is detected as AI or human.

Yes, after you run an Originality report, all scans are stored for later retrieval or sharing. Complete removal of your account and data is available upon request.

Is it written by AI? Now, with Originality.ai, you can check if text is written by AI, with world-class AI detection in 30 languages and an overall accuracy of 97.8% for our multilingual model. Read our Multilingual AI Detection Accuracy Study.

Google, along with other search engines, has made it clear that “Using automation—including AI—to generate content with the primary purpose of manipulating ranking in search results is a violation of our spam policies.” - Google (2023)

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We completed a correlation study (see study image below) and identified a small correlation between the Originality.ai score and Google search result ranking. Potentially indicating that AI content performs worse in Google than Original content.

Additionally, we found that Google Adsense can identify AI-generated text and rejected a website because of AI-generated text, and the March 5th 2024 Google Update targeted AI Spam sites.

Yes, per our Terms and Conditions, credits expire 2 years from the date of purchase.

Our internally built artificial intelligence uses supervised learning with multiple models, including a modified BERT & Roberta model to predict if it is Human or AI-written content. Our AI has been provided with millions of records, both AI and Human text, and then trained to tell the difference between the two.

Yes, ChatGPT-generated content, along with most LLMs (Gemini Pro, GPT-5, GPT-4o, Claude 3.5, Claude 4 Sonnet, Claude 4 Opus, and Llama 3.1 etc.), can be detected at a high rate of accuracy. Our ChatGPT plagiarism checker accurately detects ChatGPT-generated text. They are not perfect and do have some false positives. An AI detector does “work” depending on the level of accuracy, precision and recall you require.

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Do AI Detectors Work

Yes, Originality.ai offers a robust API. Our API has been integrated into content operations platforms for some of the largest publishers/writing agencies and marketplaces in the world. It’s designed so you can streamline checks for AI plagiarism and detect AI-written content at scale. 

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Full documentation is in the backend. Have a unique use case? Wondering about the API’s capabilities to handle your volume? Please reach out, we’re happy to discuss your needs.

An AI detection score is a prediction on whether the submitted text is AI-generated or Original (human-written). They are not a measure of the amount of AI vs the amount of Original content in a given text. 

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As AI detection scores provide a probability that content is (or is not) Likely AI, at Originality.ai, we emphasize that AI scores reflect just that — probability — not guilt.

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We recommend not applying a similar “hard” rule when it comes to working with AI scores and writers or AI detection in education. If a writer or student consistently has high Originality scores but then one article has a higher AI score, this could be a false positive and further investigation should occur. 

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‍Here is our guidance on how to interpret the AI scores for writers.