Most Accurate AI Detector

Our AI Checker, available for free below, is the Most Accurate AI Detector for GPT4.1, ChatGPT4o, Gemini 2.5, Claude 3.7, DeepSeek V3 and other popular AI writing tools.

Trusted by Industry Leaders

Neil PatelFlippaMotion InvestThe New York TimesThe GuardianSurferDotdash meredithReutersGDDiggity MarketingBusiness InsiderWriteraccessGMWalmartAT&TAAHarvard UniversityAlibaba.com

Originality.ai identified As The Most Accurate AI Detector Across Multiple Studies

Most Accurate AI Checker

Results Shown

Accuracy comparison of AI text detection tools on AH&AITD

Percentage correct for GPT-4 papers

Mean accuracy at FPR=5% for detectors on non-adversarial outputs

Mean accuracy for ChatGPT-generated and AI rephrased articles

Mean AUROC of GPT-3.5 vs. human-written, GPT-4 vs. human-written, mixed human/GPT-3.5 vs. human-written, mixed human/GPT-4 vs. human-written, translated vs, human-written

Mean accuracy for (a) human vs. AI and (b) human vs. disguised

Originaltiy.ai

97.09

100

85

100

87.9

86.5

GPTZero

63.77

57

67

45

77.28

84.5

Writer

69.05

40

Not included

Not included

Not included

Not included

CopyLeaks

Not included

100

Not included

Not included

Not included

Not included

TurnItIn

Not included

100

Not included

62

Not included

Not included

Binoculars

Not included

Not included

80

Not included

Not included

Not included

FastDetectGPT

Not included

Not included

74

Not included

Not included

Not included

ZeroGPT

Not included

83

66

92

Not included

85

GPT-2 Output Detector

Not included

Not included

Not included

85

Not included

Not included

Sapling

66.66

33

Not included

Not included

75.92

Not included

Winston

Not included

Not included

71

Not included

Not included

77

GPTkit

55.29

Not included

Not included

Not included

Not included

Not included

Zylalab

68.23

Not included

Not included

Not included

Not included

Not included

SEO.ai

Not included

83

Not included

Not included

Not included

Not included

Scribbr

Not included

69

Not included

Not included

Not included

Not included

Grammica

Not included

62

Not included

Not included

Not included

Not included

Crossplag

Not included

69

Not included

Not included

Not included

Not included

OpenAI

Not included

40

Not included

Not included

Not included

Not included

IvyPanda

Not included

40

Not included

Not included

Not included

Not included

GPTRadar

Not included

31

71

Not included

Not included

Not included

Content at Scale

Not included

52

Not included

50

Not included

Not included

ContentDetector.ai

Not included

7

Not included

Not included

Not included

Not included

GLTR

Not included

Not included

63

Not included

Not included

Not included

RoBERTa-Base (GPT2)

Not included

Not included

59

Not included

Not included

Not included

RoBERTa-Large (GPT2)

Not included

Not included

57

Not included

Not included

Not included

RoBERTa-Base (ChatGPT)

Not included

Not included

45

Not included

Not included

Not included

LLMDet

Not included

Not included

35

Not included

Not included

Not included

Studies on "Do AI Detectors work?"

Benefits of Our Free AI Detector Chrome Extension

Check for AI Content on Any Website Quickly

Quick scan

Check for AI Content on Any Website Quickly

With our Chrome Extension you can check any webpage to see if it is AI written text.

Quickly Check Content Using our Copy/Paste Window

Easy copy paste

Quickly Check Content Using our Copy/Paste Window

Easy-to-use copy and paste text window: check content within any text editor or CMS (like Wordpress).

Watch a Writer Write and Monitor for AI-generated copy

Identify Copy Paste

Watch a Writer Write

Peace of mind for writers and students. Watch a writer write the entire document with a sped up behind the scenes look and shareable report.

Features Our Enterprise and Education Customers Love

Security, Privacy, Controls & API

We understand the unique needs of high-volume web publishers, agencies, schools, and education institutions who need transparency at scale. Don’t risk the negative impacts of Google search traffic dropping or AI writing in student assignments.

Sign up now   ›
Team Management

Team Management

Add, remove and monitor usage of your organizations users. Assign roles as Admin, Manager or User  to limit individual ability to access the whole set of features.

AI Checker API

AI Checker API

Reliable, Full-Featured, and Fast API Access. See the AI detection API your developers will love.

Your Text is Encrypted

Your Text is Encrypted

TLS 1.2 or higher is achieved with our end-to-end military grade 256 bit encryption. Your content is highly protected, even our back-end engineers can’t access it.

Data Not Used in Training

Data Not Used in Training

Optionally opt-in or opt-out of your data being used in future AI training.

A Complete QA/QC Solution

A Complete QA/QC Solution

Get a full suite of QA/QC features from plagiarism checking to fact checking and readability. Publish with integrity.

One-Click delete Scan History

1-Click Delete Scan History

Easily delete all your scan history in 1 click. Keep your scan and Originality reports history organized.

Sentence Level Highlighting

Sentence Level Highlighting

Our AI content detector will highlight sentences indicating the probability of whether or not each sentence was AI written or human written.

What Is the Best AI Detector Model for Your Needs?

Patented Industry Leading Models That Fit Your Use Case

The use of AI in content writing is nuanced. We have models that are tuned to your specific use case. Whether you allow AI editing or want NO AI to get past your review we have a model that is optimized for your approach to AI text detection.

Lite 1.0.1

For students & teachers

Lite 1.0.1

When you allow AI editing (think grammarly)

  • 99%+ accurate at detecting AI content.
  • 0.5% false positive rate.
  • Allows for some light AI editing
  • Robust against humanizing methods.
Turbo

For professionals

Turbo

Zero tolerance policy on use of AI

  • 99%+ accurate at detecting AI content.
  • Under 3% false positive rate.
  • Robust against bypassing methods.
  • Does not allow for AI editing
Multi Language

For Non-English texts

Multi Language

Optimized for 30 Languages

  • Including Spanish, Portuguese, French, German, Dutch, Arabic and many other languages.
  • Removes language barriers globally.
  • Automatically detects the language.

Features of our AI Detector

Features for Writers & Students:
Prove Your Work or Assignment is Original

Our industry-leading AI detector provides you with the ability to accurately identify AI content, correct accidental AI plagiarism, and share reports to show your writing is Original.

Sign up now   ›
Shareable Reports

Shareable Reports

Easily share the results. Show your text is Original with a shareable link.

Edit

Edit

Streamline editing in-app with our fully featured text editor and then scan again.

Export

Export

Easily export text with one-click copy pasting to Google Docs or Microsoft Word for further editing.

Highlighting

Highlighting

See what sections of the text is most likely to be identified as AI-generated.

Scan History

Scan History

See a complete history of all scans that you can reference in the future as needed.

PDF Report

PDF Report

Download a PDF report showing if the text is Likely AI or Original.

Key Originality.ai Features

Web Publishers

Factual Accuracy

  • Real-time fact checking; check the latest facts (no training date cutoffs)
  • Avoid AI hallucinations like the AI book scandal
  • Save time with context and source links to verify facts fast
  • More Accurate than GPT-5: Our fact checker outperformed existing LLMs in our latest testing.
Web Publishers

Plagiarism Checking

  • Identify global plagiarism with 99.5% accuracy
  • Surpasses competitors like Copyscape, Grammarly and Turnitin
  • Modern plagiarism detection
  • Catch copy-paste and complex plagiarism types like paraphrase and patchwork
  • Shareable report to prove that writing is original and authentic
Web Publishers

Readability & Grammar Checking

  • The popular “aim for Grade 8 readability” target is wrong. Our readability scores are based on a modern study of what actually ranks well in Google!
  • Easily spot grammar and spelling issues and then refine copy in 1 click with ‘Fix issues’
  • Scale grammar and spelling checks with an API

Originality.ai is Built For…

Web Publishers

Marketers, Writers & Publishers 

Content Marketers

Teachers & Students

  • Uphold integrity and transparency across: assignments, essays, coursework, papers
  • Moodle Plugin: easily check for AI content and plagiarism in Moodle LMS
  • Peace of mind for students with a Free Chrome Extension to ‘Watch a Writer Write’
Writers

Agencies & Enterprise

  • Manage client & writer expectations for AI use
  • Integrate a process for AI detection, plagiarism checking, and factual accuracy at scale
  • Streamline editorial processes across teams with team management and report sharing

How to use Originality.ai

Paste or Upload Text

Step 1

Paste or Upload Text

Login to Originality.ai and paste your text into the editor. You may also upload a PDF to check if a document was written by AI or enter a URL for scanning.

Select Scan Types

Step 2

Select Scan Types

Select your desired scan types like AI, Plagiarism, Content Optimization, Readability, Grammar OR Fact checker to scan your text against.

Click Scan

Step 3

Click Scan

Click on the Scan button and get scores for each scan type with detailed explanations and sentence highlights wherever applicable.

The Best AI Checker - 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

Most Trusted AI Detector by Industry Leaders

Neil PatelFlippaMotion InvestThe New York TimesThe GuardianSurferDotdash meredithReutersGDDiggity MarketingBusiness InsiderWriteraccessGMWalmartAT&TAAHarvard UniversityAlibaba.com
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 There an Originality.ai Free Trial?

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.

Can I See Previous Scans?

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.

What Languages Does the AI Detector Work For?

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.

Can Google Detect and Penalize AI Content?

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)

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.

What Else Does Originality.ai Check?

Our complete content scanner provides a content quality-checking tool. Including AI Detection, Plagiarism Checking, Readability Checker, Fact Checking, Grammar and Spelling checker tool.