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.
Trustpilot reviews
(4.3/5 out of 460 reviews)
Trusted by Industry Leaders
A complete suite of QA/QC products
In addition to our AI checker features listed on this page we have a complete suite of AI tools to help Editors including Plagiarism Checking, Fact Checking & Readability Checking.
AI Checker ›
Most Accurate AI Detector for all AI writing tools. Try now for free.
Plagiarism Checker ›
See if text has been plagiarized from anywhere on the internet.
Content Optimizer ›
AI-powered content optimization that helps your content predictably rank better in Google.
Readability Checker ›
Optimize readability for your target audience to communicate clearly.
Bulk Scan ›
Scale content QA and scan an entire website’s content easily.
Grammar Checker ›
Say goodbye to typos. Catch grammar and spelling errors before you publish.
Fact Checker ›
Use our fact checking aid to help ensure your content is factually correct.
Originality.ai identified As The Most Accurate AI Detector Across Multiple Studies
Study
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
Quick scan
Check for AI Content on Any Website Quickly
With our Chrome Extension you can check any webpage you are visiting to see if it is AI written text.
Easy copy paste
Quickly Check Content Using our Copy/Paste Window
The easy to use copy and paste text window allows you to check any piece of content within any text editor, such as Wordpress.
Identify Copy Paste
Watch a Writer Write and Monitor for AI-generated copy
With our Chrome Extension you can watch the writer write the entire document at a sped up speed.
AI Detection Models to Suit Your Needs…
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.
For students & teachers
Lite 1.0.1
When you allow AI editing (think grammarly)
For professionals
Turbo
Zero tolerance policy on use of AI
For Non-English texts
Multi Language
Optimized for 30 Languages
Including Spanish, Portuguese, French, German, Dutch, Arabic and many other languages.
Web Publishers
Uphold your site's credibility by ensuring every article is original, trustworthy, and AI-checked before it reaches their audience or impacts search rankings.
Content Marketers
Maintain brand integrity, optimize for SEO, and ensure content resonates with human audiences, while staying compliant with originality and factual accuracy.
Writers
Ensure your content is original, polished, and publication-ready. Trust our tools to avoid AI overuse, maintain authenticity, and meet editorial standards.
Step 1
Paste or Upload Text
Login to Originality.ai and paste your text into the editor. You may also upload a PDF or enter a URL for scanning.
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.
Step 3
Click Scan
Click on the Scan button and get scores for each scan types with detailed explanations and sentence highlights wherever applicable.
How do AI detectors work?
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 then trained to tell the difference between the two.
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”.
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.
Do AI Detectors Work and Can ChatGPT Be Detected?
Yes, Chat GPT generated content along with most LLM’s (Gemini Pro, GPT-4, GPT-4o, Claude 3.5, 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.
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.