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QuillBot
quillbot.com › ai-content-detector
AI Detector & AI Checker - Detect ChatGPT, GPT-5 & Gemini Text
QuillBot's Free AI Detector - Use our AI checker to analyze text and identify content generated from ChatGPT, GPT-5, Gemini, Claude, and other AI platforms.
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ZeroGPT
zerogpt.com
AI Detector - Trusted AI Checker for ChatGPT, GPT5 & Gemini
AI Content Detector and ChatGPT Detector, simple way with High Accuracy. AI Checker & AI Detector Free for AI GPT Plagiarism by ZeroGPT.
People also ask

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 doesn’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 › home › ai detector
AI Detector - Free AI Checker for ChatGPT, GPT-5, Gemini & More
What is the most accurate AI detector?

According to Cornell University, the answer is Copyleaks AI Detector. In July 2023, a study published on arXiv by Cornell Tech researchers declared Copyleaks AI Detector the most accurate for detecting LLM-generated text.

Further independent studies have validated its accuracy and efficiency.

Read more about these third-party studies.

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copyleaks.com
copyleaks.com › home › ai detector
AI Detector - Free AI Checker for ChatGPT, GPT-5, Gemini & More
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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.
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Undetectable AI
undetectable.ai
AI Detector & AI Checker for ChatGPT (Free) - Undetectable AI
Paste your text into our free AI detector to see if it’s flagged as AI. Get instant results from our AI checker and ChatGPT detector.
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Copyleaks
copyleaks.com › home › ai detector
AI Detector - Free AI Checker for ChatGPT, GPT-5, Gemini & More
Copyleaks boasts one of the largest language databases for AI content detection, supporting over 30 languages with low false-positive rates for non-native English text. Whether you’re scanning content in English, French, German, Italian, Portuguese, Spanish, Japanese, Chinese (Simplified and Traditional), Russian, Dutch, or beyond, you can trust our AI Detector to deliver consistent, reliable results.
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Grammarly
grammarly.com › ai-detector
AI Detector: Free AI Checker for ChatGPT, GPT5 & Gemini
Use Grammarly's free AI detector to identify content generated by ChatGPT, GPT5, and Gemini. Our AI checker provides reliable and free results, no sign-up needed.
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NoteGPT
notegpt.io › ai-detector
AI Detector & Checker - Trusted, Free for ChatGPT, Claude, Gemini
Our AI Detector offers near 100% accuracy in detecting content generated by AI models like ChatGPT, Gemini, Claude, and more.
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Decopy
decopy.ai › ai-detector
AI Detector - Trusted AI Checker (Free & No SignUp)
Decopy’s free AI Detector is the best AI Checker tool that can be used to detect content generated by AI models such as ChatGPT, Gemini, Claude, LLaMa, etc.
Find elsewhere
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Scribbr
scribbr.com › home › free ai detector
AI Detector - Trusted AI Checker for ChatGPT, Copilot & Gemini
May 20, 2025 - Scribbr AI Detector: Identify AI-generated content from ChatGPT, Copilot, and Gemini with our advanced AI Checker. Try it for free!
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Content @ Scale
contentdetector.ai
AI Content Detector: AI Checker for ChatGPT, Claude, Gemini
Using ContentDetector.ai has significantly improved our content review process. It’s incredibly easy to use and provides detailed reports that help us identify and address AI-generated content swiftly. The added functionalities like word and character counters are a bonus.
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Gowinston
gowinston.ai › home
The Most Trusted AI Detector | ChatGPT Detection Tool
December 27, 2022 - Winston AI is the industry leading AI content detector and plagiarism checker for ChatGPT, Claude, Google Gemini and more.
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Sapling
sapling.ai › ai-content-detector
AI Detector | GPT-5, Claude 4.5, Gemini 2.5, Qwen3, DeepSeek-V3 | Sapling
Free AI content detector with 97% accuracy. Detects GPT-5, Claude 4.5, Gemini 2.5, Qwen3, DeepSeek-V3 and other AI models. Analyze text, PDFs, and Word documents.
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Originality AI
originality.ai › ai-checker
AI Detector - Most Accurate AI Content Checker for ChatGPT - Originality.ai
We have a full time “Red Team” that is actively testing strategies to make undetectable AI content. Once they find a strategy (such as Paraphrase Plagiarism) that can create high quality undetectable AI generated text and bypass our AI content detector we improve our AI technology and make it detectable.
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JustDone
justdone.com › ai detector
AI Detector – Trusted AI Checker for ChatGPT, GPT5 & Gemini | JustDone AI
Use JustDone AI checker to detect content from ChatGPT, GPT-5, Gemini, Claude, and other AI platforms. Fast, accurate AI detection and Turnitin score estimation.
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Humanize AI
humanizeai.pro › detector
Free AI Detector - Advanced AI Checker for ChatGPT, Gemini & More
Best free AI detector & checker for AI content. Check ChatGPT, Gemini, GPT-4, GPT-5 & other AI-generated content and instantly get an overall AI score.
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MyDetector
mydetector.ai
Free AI Detector - Accurate AI checker for chatGPT & More
MyDetector's Free AI Detector analyzes ChatGPT, GPT-4, Gemini & Claude content. Get 99% accurate AI checker results instantly—no login required.
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SciSpace
scispace.com › home › ai detector
AI Detector & Checker for Text, PDFs | Fast & accurate - SciSpace
SciSpace AI Detector instantly spots ChatGPT, GPT-4, Gemini, Llama and Claude’s text, rates originality, and explains risky lines. Proven to outperform GPTZero, ZeroGPT, and Grammarly.
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Medium
medium.com › freelancers-hub › best-ai-detectors-2025-35a58eac86c5
I Tested 30+ AI Detectors. These 10 are Best to Identify Generated Text.
2 weeks ago - Looking for the best AI detectors in 2025? I tested 5 top AI detection tools, including GPTZero and Originality.ai, to find the most accurate AI content verification tool.
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QuillBot
quillbot.com › word-counter
Free Word Counter Tool: Count Words of Any Length—QuillBot AI
QuillBot’s word counter is a free, easy-to-use tool for tracking the word count in your writing. Our online word count tool provides data for words and lets you simply change whether spaces should be counted as characters.
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QuillBot
quillbot.com › home › quillbot’s ai detector: the best ai detector
QuillBot’s AI Detector: The Best AI Detector
July 1, 2025 - AI Detector, which detects both AI-generated and AI-refined text · Plagiarism Checker, which accurately analyzes texts for plagiarized content and provides actionable feedback · Word Counter, which provides insights into the word count and ...