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GPTZero
gptzero.me
AI Detector - Free AI Checker for ChatGPT, GPT-5 & Gemini
Best free AI detector - simply paste your text to instantly get an overall AI score and advanced sentence by sentence detection.
Pricing
The World's #1 AI Content Detector with over 8 Million Users
For studentsTools to improve your writing and avoid false accusations
GPTZero is the #1 AI Detector for Students. Check AI-written text, improve essays, and get plagiarism checks with free and advanced student plans.
For teachersFoster academic integrity in the classroom
Use GPTZeroโ€™s AI detector for teachers to preserve academic integrity, elevate classwork, and streamline grading, identify AI-generated text and check for plagiarism.
Plagiarism CheckerDetect content from outside sources
Plagiarism is taking someone elseโ€™s ... detector helps educators and students to avoid doing this accidentally. GPTZeroโ€™s plagiarism checker is built for accuracy and transparency. We are able to detect plagiarism from over 100M scholarly articles, research papers, websites, and books with confidence. Presenting AI-generated text as your own ...
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QuillBot
quillbot.com โ€บ ai-content-detector
AI Detector & AI Checker - Detect ChatGPT, GPT-5 & Gemini Text
An AI detector is a tool designed to analyze written content and identify whether it was created by a human or generated by artificial intelligence. It can detect content from major models, including ChatGPT, Gemini, Claude, and Llama, and ...
Discussions

How trustworthy are these AI text detectors? Like some even show human written text as AI generated. How do you all validate it?
Hi! Welcome to r/Writers - please remember to follow the rules and treat each other respectfully, especially if there are disagreements. Please help keep this community safe and friendly by reporting rule violating posts and comments. If you're interested in a friendly Discord community for writers, please join our Discord server I am a bot, and this action was performed automatically. Please contact the moderators of this subreddit if you have any questions or concerns. More on reddit.com
๐ŸŒ r/writers
38
2
December 13, 2024
Can someone here PLEASE tell me what is the best FREE AI Detector that actually works/ if there isn't one: are your colleges helping fund it?
There will never be a reliable one. More on reddit.com
๐ŸŒ r/Professors
181
53
March 30, 2025
Best AI Checker โ€“ Which One Actually Works?
I've utilized a pair of these (GPTZero was inconsistent for me), but truly, AI detectors can only proceed so far, particularly when the importance is great such as with scholarly material. I once had a document flagged simply because it "seemed too polished". Following that disarray, I quit taking chances and began getting assistance from LeoEssays . They genuinely compose everything anew, so I have never encountered problems with AI identification methods. The advantage? It is organized correctly, novel, and does not read as though it originated from an automated system. If you aim to bypass AI alerts yet still obtain excellent output, they represent a much more secure option than attempting to expertly manipulate the detectors. More on reddit.com
๐ŸŒ r/WritingWithAI
141
32
February 12, 2025
AI Detector
Here are the 11 best and most popular (not sure best) AI checkers I want to test: (How did I check popularity? I simply used SEO tools to estimate their traffic and sorted them by that. If any AI detectors are missing here, itโ€™s because they donโ€™t work, users donโ€™t like them, or theyโ€™re not investing in marketing, haha, soโ€ฆ sorry!) If you want to avoid high detection and humanize ai content - read my tutorial How to Humanize AI & Best AI humanizers Best AI Humanizers with proofs reviewed here: https://www.reddit.com/r/DataRecoveryHelp/comments/1oqwdib/best_ai_humanizer ๐ŸŽ If you need to Humanize AI right away try this: https://aihumanizer.net - 100% Free Ai humanizer (nice human score in ZeroGPT & GPTZero, simple language) https://www.zerogpt.com/ -ย ZeroGPT Checkerย (My top choice. Easy to fool when you rewrite content in a conversational style.) https://gptzero.me/ -ย GPTZero AI Detectorย (Very inconsistent results. Since the September update it has become unstable - some texts score 0%, others 100% AI, with no clear logic.) https://quillbot.com/ai-content-detector -ย Quillbot AI Checkerย (Works fairly well. Can be fooled by using natural language and avoiding a rigid, formal tone.) https://www.scribbr.com/ai-detector/ -ย Scribbr AI Detectorย (Just an iframe of Quillbotโ€™s checker.) https://www.grammarly.com/ai-detector -ย Grammarly AI Checkerย (Very weak detector, easy to trick.) Less popular AI detectors: https://originality.ai/ai-checker Originality AI Checkerย (Feels scammy. Almost always shows 100% AI, but if you add intentional errors it marks them as human. Very odd.) https://undetectable.ai/ Undetectable AI Detector https://decopy.ai/ai-detector/ Decopy AI Detector https://notegpt.io/ai-detector NoteGPT AI Detector https://copyleaks.com/ai-content-detector Copyleaks AI Detector https://gowinston.ai/ Winston AI Detector I would not review each pros and cons and plans intentionally. Who cares? You can look yourself. I will only get scores before and after and share with you. Reddit allows you to attach only one image per post, so, sorry! What AI detector do colleges & students use? Itโ€™s definitely Turnitin AI Checker. Thereโ€™s no free way to check it without registration. I tried, and it asked whether Iโ€™m a student, instructor, or teaching assistant. I didnโ€™t want to lie, so I quit. But Iโ€™ve read a lot of Reddit discussions, and both students and teachers give the same answer to the question: โ€œHow accurate is Turnitin AI Detector?โ€ The simple answer: Not accurate. Haha! Lots of false positives and easy to manipulate with special prompts. Ok letโ€™s do a simple test of the rest popular best AI detectors and checkers: For this test, Iโ€™ll generate a simple essay titled โ€œWhat is an AI Detector and How Do They Work?โ€ (500 words). Then Iโ€™ll show you the score before and after some basic humanization using simple prompts.Iโ€™m intentionally skipping web-based AI humanizer tools because I already covered those in this tutorial.Iโ€™ll use ChatGPT 4.1 Mini โ€“ fast and cheap. I assume a lot of writers and students might be using this specific model. More on reddit.com
๐ŸŒ r/DataRecoveryHelp
75
182
June 15, 2025
People also ask

Can the AI Detector detect mixed text where human-created text has been amended with AI-generated text?

Yes. Our detection report identifies specific elements written by humans and distinguishes them from AI-generated text, even when mixed.

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copyleaks.com
copyleaks.com โ€บ home โ€บ ai detector
AI Detector - Free AI Checker for ChatGPT, GPT-5, Gemini & More
What is the best AI detector?
GPTZero is consistently rated the most accurate and reliable AI detector across various use cases. Reliability: In 2025, G2 ranked GPTZero the #1 most trusted and reliable AI tool, above Grammarly. Accuracy: GPTZero is the most accurate AI detector with 99% accuracy rates across diverse datasets, independently reviewed by AI labs at top institutions. Independent reviewers, including Tom's Guide, testing all popular detectors named GPTZero the most accurate. Best Interpretability: GPTZero is the only detector that explains exactly why text is AI with natural language. GPTZero also has the most
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gptzero.me
gptzero.me
AI Detector - Free AI Checker for ChatGPT, GPT-5 & Gemini
What is the best AI Detector?

Copyleaks is an industry leader in accuracy, scalability, integration, and security. 

Several significant differences exist between our AI content detection tool and the rest of the market. For example:

  • We use large-scale, credible data with machine learning to understand text patterns, resulting in over 99% accuracy.
  • We offer seamless API and LMS integrations.
  • The detector can analyze and identify AI-generated code, even if altered.
  • Our AI checker doesnโ€™t flag non-AI features of Grammarly, like spell check and grammar, unlike other tools.
  • All Copyleaks products are fully GDPR-compliant and certified to SOC 2 and SOC 3 standards.
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copyleaks.com
copyleaks.com โ€บ home โ€บ ai detector
AI Detector - Free AI Checker for ChatGPT, GPT-5, Gemini & More
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Scribbr
scribbr.com โ€บ home โ€บ free ai detector
AI Detector - Trusted AI Checker for ChatGPT, Copilot & Gemini
May 20, 2025 - Our AI Detector is carefully trained to detect most texts generated by popular tools like ChatGPT and Bard. These texts often contain certain phrases, patterns, or awkward wording that indicate they were not created by a human.
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ZeroGPT
zerogpt.com
AI Detector - Trusted AI Checker for ChatGPT, GPT5 & Gemini
Our model specializes in identifying AI generated content like Chat GPT, GPT 3, GPT 4, GPT5, Gemini, Grok, Perplexity AI, Claude, DeepSeek, LLaMa models โ€ฆ Finally, we employ a comprehensive deep learning methodology, trained on extensive text collections from the internet, educational datasets, and our proprietary synthetic AI datasets produced using various language models.
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NoteGPT
notegpt.io โ€บ ai-detector
AI Detector & Checker - Trusted, Free for ChatGPT, Claude, Gemini
NoteGPT's free AI Detector accurately identifies AI-written content. Use our trusted AI text detector to check for ChatGPT, Claude, and Gemini text with ease.
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Fortune
fortune.com โ€บ 2025 โ€บ 12 โ€บ 22 โ€บ how-can-you-tell-if-ai-wrote-something
It's starting to look like we'll never come up with a good way ...
2 days ago - In effect, AI text detection is ... trained, the detector examines new text and predicts whether it more closely resembles the AI-generated examples or the human-written ones it has seen before....
Find elsewhere
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Grammarly
grammarly.com โ€บ ai-detector
AI Detector: Free AI Checker for ChatGPT, GPT5 & Gemini
Grammarlyโ€™s AI detector tool displays a percentage that indicates how much of the text provided appears AI-generated, as assessed by our detection model. Our machine-learning model is trained on hundreds of thousands of human and AI-generated texts. Grammarly breaks your text into smaller sections, checking each section against the model for language patterns typically indicative of AI text.
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Originality AI
originality.ai
AI Detector - Most Accurate AI Content Checker for ChatGPT - Originality.ai
Originality.ai's Free AI Detector - Use our free AI checker to identify if text was generated from a popular AI platform like ChatGPT, Gemini, Claude, Grok and others.
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Copyleaks
copyleaks.com โ€บ home โ€บ ai detector
AI Detector - Free AI Checker for ChatGPT, GPT-5, Gemini & More
With over 30 supported languages and detection for ChatGPT, Gemini, Claude, and more, Copyleaks is the go-to free AI text checker for students, writers, professionals, and creators.
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WRITER
writer.com โ€บ ai content detector
AI content detector | ChatGPT detector & AI checker for GPT-4 - WRITER
October 14, 2025 - Check what percentage of your content is seen as human-generated with this free AI content detector tool. Paste in text or a URL to find out.
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Pangram Labs
pangram.com
Pangram Labs | Accurate AI Detector for ChatGPT & More
Our AI detection tools are a way to identify AI-generated text and restore user trust in text. Pangram can detect AI-generated content in both short-form and long-form written content, with up to 99% accuracy.
Published ย  November 15, 2025
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MyDetector
mydetector.ai
Free AI Detector - Accurate AI checker for chatGPT & More
MyDetector AI checker free tool uses machine learning models trained on human and AI text data. It analyzes content to spot AI-generated patterns like repetition, lack of creativity, or unnatural transitions.
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SurgeGraph
surgegraph.io โ€บ ai-detector
Free AI Detector: Catch AI Writing Instantly
Spot AI-generated text in seconds with our free AI detector. Scan any content and see its human vs AI score for free.
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Medium
medium.com โ€บ freelancers-hub โ€บ i-tested-5-ai-detectors-heres-my-review-about-what-s-the-best-tool-for-2025-35a58eac86c5
I Tested 30+ AI Detectors. These 10 are Best to Identify ...
2 weeks ago - QuillBot is one of the popular tools among writers as it is easy to use and gives accurate results. This tool lets you detect AI-generated text, humanize text, correct Grammar, find citations, check Plagiarism, manage projects, ...
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SciSpace
scispace.com โ€บ home โ€บ ai detector
AI Detector & Checker for Text, PDFs | Fast & accurate - SciSpace
SciSpace AI Detector instantly spots ChatGPT or GPT-4 text, rates originality, and explains risky lines - helping researchers keep assignments and papers authentic.
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Nocramming
nocramming.com โ€บ ai-detector
AI Detector | Free Tool for Instant AI Checks
Trained on millions of real human texts, our AI detector free tool can tell you which parts are likely written by AI with high accuracy.
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Turnitin
turnitin.com โ€บ solutions โ€บ topics โ€บ ai-writing
AI Checker Solutions: Ensure Academic Integrity | Turnitin
Two of the 16 detectors, Turnitin and Copyleaks, correctly identified the AI- or human-generated status of all 126 documents, with no incorrect or uncertain responses. Three AI text detectors โ€” Turnitin, Originality, and Copyleaks โ€” have very high accuracy with all three sets of documents examined for this study: GPT-3.5 papers, GPT-4 papers, and human-generated papers.
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Phrasly
phrasly.ai โ€บ ai-detector
Free AI Detector & AI Checker | Phrasly
Here's what makes Phrasly different: Phrasly's AI checker achieves 99.8% accuracy in detecting AI-generated text from the latest models including ChatGPT, Claude, Gemini, and other AI writing tools.
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WriteHuman AI
writehuman.ai โ€บ ai-detector
WriteHuman: Best AI Detector and AI Content Checker
Discover WriteHuman's Free AI Detector: a cutting-edge AI checker for accurately distinguishing between A text and human-written text.