Accurate AI Detector

Originality.ai℠ is the Most Accurate AI Detector in third-party studies. Check up to 2,000 words with 3 Free AI Scans Per Day.

Accurate on leading LLMs: GPT-5.6 (Sol, Luna, Terra), Claude Fable 5, Gemini 3, Kimi K3, DeepSeek V4 (Flash & Pro) and more.
Originality.ai℠ offers business consulting services in the field of AI-generated content verification
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Harvard University
The Guardian
The New York Times
Flippa
Motion Invest
Surfer
Dotdash meredith
GD
Diggity Marketing
Writeraccess
GM
Alibaba.com
Walmart
AT&T
AA
Reuters
Neil Patel
Harvard University
The Guardian
The New York Times
Flippa
Motion Invest
Surfer
Dotdash meredith
GD
Diggity Marketing
Writeraccess
GM
Alibaba.com
Walmart
AT&T
AA
Reuters
Neil Patel

How to use Originality.ai?

Paste or Upload Text

Step 1

Add Text

Paste, Upload, or URL

Select Scan Types

Step 2

Scan

AI Allowance, Plagiarism, Content Quality, and more

Click Scan

Step 3

Review Results

See scores for each selected scan. Then, adjust AI Allowance or try Deep Scan.

Proven AI Detection Accuracy

Trained on “Adversarial Data”

Detect AI Paraphrasing

Our team actively tests AI tools that change, modify, or edit text (e.g. Quillbot or Grammarly) and continuously improves our AI detector to ensure attempts to hide AI-altered text are still detectable.

GDocs

Manage False Positives

Replay Writing

Check for AI and plagiarism with the Originality.ai Chrome Extension.

Peace of mind for writers and students to show the authorship of writing, with a Writing Replay.

Features for Enterprise & Education

API, Security & Privacy

Built for the unique needs of enterprise, high-volume web publishers, agencies, and schools.

AI Checker API

AI Checker API

A reliable, Fast, AI Detection API your developers will love.

A Complete QA/QC Solution

QA/QC Solution for Teams

Assign team roles and access full features from AI scans to content quality checks. 

Your Text is Encrypted

Text Encryption

TLS 1.2 or higher, with end-to-end military grade 256 bit industry-standard encryption.

Data Not Used in Training

Training Data is Optional

Opt-out of AI training data use and delete scan history in 1 click.

Features for Students & Writers

Show Your Work is Original

Accurately identify AI content, fix accidental plagiarism, and share reports to show writing is original.

Shareable Reports

AI Allowance

Choose how much AI you allow. AI detection that adapts to your hybrid-content workflow.

Shareable Reports

Deep Scan

See why text is likely flagged as AI and how to ethically edit it, so it sounds more natural.

Highlighting

Sentence Highlights

See which sentences are most likely AI with highlights.

PDF Report

PDF Report

Easily access scan history, get a shareable report link, or download a shareable PDF report.

Originality.ai is Built for...

Marketers, Writers & Publishers 

Writers, Editors & Marketers

Login to Originality.ai  ›
Teachers & Students

Teachers & Students

Try Originality.ai  ›
Agencies & Enterprise

Enterprise & Schools

  • Manage teams and assign roles
  • Scale AI, plagiarism, and fact checks
  • Support learning and AI transparency
  • Enterprise pricing plans
  • Industry-standard security
Discover Originality.ai  ›

Flexible Pricing

Discover flexible pricing for students, teachers, small teams, agencies, publishers, and enterprise.

Customers Love Originality.ai

Sam Saltis

Sam Saltis

Originality is a great tool for detecting AI content. The product has been invaluable for our content marketing team. Fernanda and the team are always very responsive and helpful. Highly recommend this product.

Miguel Maloney Thompson

Miguel Maloney Thompson

I have the opportunity to make sure that my writing is plagiarism-free, and with a lot of AI-generated content around, I can ensure my writing does not get flagged as just another to the bunch.

I do technical writing where there are only so many ways to describe concepts and ideas. However, Originality.ai gives me the opportunity to personalize my writing even more, which is an advantage. With some time, I can give my content a sense of uniqueness.

John Kohn

John Kohn

Reliable and trustworthy. Originality is always so quick to respond to my questions and lend a helping hand. It’s a very good tool for detecting ChatGPT use on academic papers, especially with the "view writing" feature which shows the text being typed by the student as they were typing it.

Stevie Lambert

Stevie Lambert

AI is accurate compared to free choices and the support staff like Ellie are very helpful. The interface is easy to use and shows a % chance of the work being AI. It’s also, nice that it shows what parts may be AI or not.

Aptidus

Aptidus

The service provided is exceptional, offering the most accurate and reliable AI detector available on the market. The customer support team is exceptionally responsive.

Gbas gbos

Gbas gbos

Originality's AI checker and plagiarism detector are absolutely phenomenal—by far the best I have used (yes, I used all of Winston, GPT zero, etc.). The Turbo model is CRAZY good! 

Vivek Pandey

Vivek Pandey

There are lots of similar AI detection tools available online but nothing comes even close to what they offer. I can't trust any other tools other than theirs. Have tried maybe 20-30 other websites and settled with them.

Yanmin Wang

Yanmin Wang

I had an excellent experience with the support team at Originality.ai. They were incredibly responsive and provided clear, detailed answers to all my questions. The explanations were thorough, and I now have a much better understanding of how the platform works and how my content is handled. 

The team was patient and professional and went above and beyond to ensure all my concerns were addressed. I truly appreciate their help and the top-notch customer service they provide. Highly recommended!

Canadian Law Student

Canadian Law Student

Originality.ai is the best tool on the market. I have used comparable services and this one is exceptional. It provides an accurate report with a match score which really helps writers/researchers adjust and improve their work. 

There are also advanced features such as paraphrase detection which are not available with any other comparable service. The features provided by Originality.ai are exceptional for users who want to avoid plagiarism and also improve their research process. I hope to continue using Originality.ai for many years to come.

John Willsdon

John Willsdon

This is a really helpful tool. Certainly the best of the AI detectors I tried. What makes it great is that you also get a bunch of other tools that are really helpful. The fact checker is awesome, it gives you feedback on whether or not points in your essay are factual or not by reading the source material in your citations.

Todd

Todd

I have been using this tool since the start! And it has saved me many times. Many times when checking clients' sites the problem was AI content or plagiarism.

Chris Swanson

Chris Swanson

When I hire writers, I want 100% human-written content. I depend upon Originality.ai to check this for me.

Dirk Berger

Dirk Berger

Originality.ai saved me from making a big mistake. I have written a book with the help of ChatGPT, 40% of my work is AI; 60% is human. It identified the AI, and now I am writing it all by myself. 88-100% human. Thank you Originality.ai.

Rob McTavish

Rob McTavish

I started to look for an easy tool to confirm my suspicions over some of the material being submitted by my students in first-year Communication courses. I found Originality.ai and tried it out. It worked so well that I actually tested it out with some material I created using AI as an example and sure enough, it perfectly determined which was my work, what was totally AI-written, and what was edited AI material.

Andrew Stevenson

Andrew Stevenson

Originality.ai has been remarkable in its ability to detect AI content. The customer service is also incredible in how thorough and responsive they are. Highly recommend this program.

Pieter Steenkamp

Pieter Steenkamp

I found Originality.ai to be the best AI detector. I use it for my student's assignments and recommend it to my colleagues.

JC Playz

JC Playz

Originality really lives up to the expectations, it's super reliable and has the best detector for AI. Now I can understand why so many people use it such as professionals.

Trish McLean

Trish McLean

Incredible experience. Excellent product. Very easy to use, thorough and informative. Brady was incredibly helpful on the chat. He carefully checked my document to see why it had a high score for AI and then explained it to me. He provided individualized advice on how to move forward. Excellent! Thank you Brady.

Joseph Bereber

Joseph Bereber

Customer service is top-notch. Not only are they super accommodating, they are also super helpful. The tools on Originality.ai are also incredibly accurate and very useful. I've had nothing but positive experiences using this service.

Peter Stuart

Peter Stuart

Originality.ai is by far the best AI detector tool. We have used other tools to detect AI in content but we have found that Originality.ai is by far the most accurate. This, combined with flexible payment plans to suit individual requirements and sharp customer support. Originality.ai is a no-brainer if you are looking for an AI detection solution.

In the Press

CNN

Jennifer Korn

How companies are embracing generative AI for employees…or not

Many prominent companies have entirely blocked internal ChatGPT use, including JPMorgan Chase, Northrup Grumman, Apple, Verizon, Spotify and Accenture, according to AI content detector Originality.AI, with several citing privacy and security concerns.

Read more ›
Politico

Ben Schreckinger

AI vs. public opinion

Originality.ai, a site that provides detection services for AI-generated content and plagiarism, published a convenient tracker that lists the 10 pending lawsuits against OpenAI and ChatGPT.

Read more ›
The Guardian

Betsy Reed

Mushroom pickers urged to avoid foraging books on Amazon that appear to be written by AI

Four samples from the books were examined for the Guardian by Originality.ai, a US firm that detects AI content.

Read more ›
The New York times

Steven Lee Myers & Tiffany Hsu

Another Side of the A.I. Boom: Detecting What A.I. Makes

More than a dozen companies have popped up to offer services aimed at identifying whether photos, text and videos are made by humans or machines.

Read more ›
Financial Times

Generative AI: hype not hyperintelligence is lifting values

Generative artificial intelligence could produce magic in the sky, says Sam Altman founder of pioneering start-up OpenAI. Successful entrepreneurs are entitled to make visionary statements.

Read more ›
Axios

Sara Fischer

Major websites are blocking AI crawlers from accessing their content

Nearly 20% of the top 1000 websites in the world are blocking crawler bots that gather web data for AI services, according to new data from Originality.AI, an AI content detector.

Read more ›
Nature

Andrea Taloni, Vincenzo Scorcia, and Giuseppe Giannaccare

Modern threats in academia: evaluating plagiarism and artificial intelligence detection scores of ChatGPT

Plagiarism and research integrity are sensitive issues in the academic setting, especially after the recent offspring of artificial intelligence (AI) and large language models (LLMs) such as GPT-4.0 [1].

Read more ›
Digiday

Sara Guaglione

Why publishers are questioning the effectiveness of blocking AI web crawlers

A number of publishers — including Bloomberg and The New York Times — were quick to block OpenAI’s web crawler from accessing their sites, to protect their content from getting scraped and used to feed the artificial intelligence tech company’s large language models (LLMs).

Read more ›

Frequently Asked Questions

Is the Originality.ai AI detector free?

Is Originality.ai free, or is there a free Originality trial? We don’t offer a free trial of Originality.ai. Instead, we offer a limited free AI detection tool, with 3 free daily scans.

What Can Cause False Positives?

Tools that use AI to rewrite or edit copy (e.g., some Grammarly features) can cause false positives. Shorter text may impact accuracy; we have a 100-word minimum at Originality.ai.

Classic Model: An AI detection score of 60% Likely Original and 40% Likely AI is not a false positive. It correctly predicted with 60% confidence that your content was Likely Original.

AI Allowance scans (new): Align how much AI you allow with project guidelines. 

How Can I Show My Work or Assignment is Original?

An AI score shouldn’t be used alone for academic integrity discipline.

Students and Writers: Share accuracy studies and show your writing process with our Chrome Extension.

Can I See Previous Scans?

Yes, scan history is stored for later retrieval or sharing. Complete removal of your account and data is available upon request.

What Languages Does Originality.ai AI Detection Support?

With Originality.ai, you can check if text is written by AI in 30 languages, with an overall accuracy of 97.8% for our multilingual model. Multilingual AI Accuracy Study.

Do Credits Expire?

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

How many free AI scans are there?

Check up to 2,000 words with the free AI checker, and run up to 3 free AI scans daily. To scan more words, upgrade to premium.

Do I need an account to run a free AI scan?

No, you can run up to 3 free AI scans daily without an account. To scan more words and run additional scans, you can conveniently sign up for Originality.ai.

Is my pasted text stored, shared, or used for training?

Text input into the free AI detector may be used for training. Users with an Originality.ai account can opt out of data use for AI training.

What does the AI score mean?

AI scores are predictions (probabilities) on whether text is AI-generated or Original (human-written). At Originality.ai, we emphasize that AI scores reflect probability, not guilt.
If you select AI Allowance, you choose how much AI you allow. So, your AI score reflects whether the percentage of AI writing is likely more or less than your selection.

Should an AI score be used on its own?

Use an AI score as one signal, not a final decision. Review other details like writing history and drafts before any high-consequence decisions. Always keep a human reviewer in the loop.

How does the Originality.ai AI detector work?

The Originality.ai AI Checker is based on a modified version of the BERT model and forms part of our patented all-in-one text analysis and verification system (U.S. Patent No. 12,253,988). For in-depth details on training, fine-tuning, and more, check out this blog post and this post to learn about our patented technology.

Does Originality.ai Detect AI Paraphrasing?

Originality.ai is accurate at detecting AI-paraphrased content (e.g., Quillbot). If you permit AI paraphrasing, adjust how much you allow with AI Allowance; read more in our accuracy study.

What Are AI Detection False Positives?

AI Detection false positives happen when human writing is incorrectly classified as AI-generated. At Originality.ai, we transparently share false positive rates in our accuracy study.

Note: False positive rates can vary by AI detection model and brand.