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
A complete suite of QA/QC products
Originality.ai offers a complete suite of patented AI tools for writers, students, editors, marketers, web publishers, and educators including, AI detection, Plagiarism Checking, Fact Checking & Grammar 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
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Grammica
Not included
62
Not included
Not included
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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
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LLMDet
Not included
Not included
35
Not included
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Not included
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.
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).
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.
What Is the Best AI Detector Model for 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
Factual Accuracy
Plagiarism Checking
Readability & Grammar Checking
Marketers, Writers & Publishers
Teachers & Students
Agencies & Enterprise
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.
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 type with detailed explanations and sentence highlights wherever applicable.
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.