What it is
Overview
GPTZero detects AI-generated text from ChatGPT, Gemini, and Claude using proprietary detection algorithms. Built specifically for educators managing academic integrity, the tool analyzes writing at the sentence level and highlights suspected AI content with transparency scores. The 12 million monthly visitors are primarily teachers, academic administrators, and content managers who need to verify whether student submissions or published content was human-written.
At a glance
Usability & Quality overview
Best for
- quick AI-content checks
- educators doing lightweight screening
- users who value a simple interface
Watch out for
- false positives on human or edited writing
- subscription and free-tier limits
- limited trust for high-stakes academic decisions
Real product, not a wrapperIndependent product
GPTZero offers proprietary AI detection models specifically trained for academic content, plus integrations with educational platforms that ChatGPT doesn't provide. The specialized fine-tuning for detecting AI-generated academic writing and sentence-level analysis features represent genuine differentiation from general-purpose AI tools.
Strong evidenceQuality score
GPTZero An easy-to-use AI content detector with quick text scanning, but false positives remain common.
This score is our editorial judgment, computed automatically from the sources, weights, and dates shown above. It reflects the data we could verify as of July 28, 2026, not a guarantee or statement of fact about GPTZero. Third-party ratings and quotes belong to their original platforms and authors. Thin data lowers our confidence label, and we say so instead of guessing. Work on GPTZero? Dispute any datapoint and we will review it, publish your response, and correct verified errors.
Plans
Pricing
How free is free?
Free with limits
10,000 words/month free; Premium $156/year for 300k words
What you get for free
- 10,000 words per month scanning limit
- Basic AI scan functionality
- 3 free advanced scans
- 5 free AI highlights in Chrome extension
Behind the paywall
- Higher word limits (300k+ words/month)Premium
- Advanced AI scanPremium
- Multilingual AI detectionPremium
- Download AI reportsPremium
- Bulk file scanning (250+ files)Professional
- LMS IntegrationProfessional
Cost to actually use
Based on 23 classified review complaints about rate limits, credits, and billing.
Community feedback
Aggregated reviews
Ratings and quoted comments below are aggregated from third-party sources and reflect those users' views, not SearchTools.ai's.
What reviewers talk about
themes inside the Sentiment pillar â not score ingredients
17Output Quality146 mentions
âExceedingly accurate at detecting AI text, simple to use and free for 10,000 characters. Fast and allows for file upload as well. I've never needed to use support since the process is easy. When you paste the text it opens in another browser tab to process, this is annoying. When we check customer feedback and reviews we use this tool to help ascertain the genuineness of the informationâ
âAbsolutely the worst AI detector around. I put in a children's book I wrote in the 1970s and it's telling me it's 100% AI! Don't waste your time or money on this lousy program. Also, put in Dr. Suess and it comes back as AI as well.â
âOutil simple dâutilisation et rapide, mais malheureusement beaucoup trop imprĂ©cis dans sa dĂ©tection. AprĂšs plusieurs tests effectuĂ©s sur des textes entiĂšrement rĂ©digĂ©s par des humains, plusieurs rĂ©sultats indiquaient un score de 100 % IA. Lâoutil considĂ©rer Ă tort des phrases simples ou naturelles comme Ă©tant gĂ©nĂ©rĂ©es par IA, ce qui rend presque impossible lâobtention dâun texte reconnu comme « non IA ». â
âThey combine the least accurate tool on the market with the absolutely worst support. In fact it's not short of a scam, I got overcharged by 60Euros (which is very easy to verify from their backend) but all I get from the support is gaslighting.. Do no put your credit card in this thing there are many better alternatives out thereâ
35Value & Pricing20 mentions
âExceedingly accurate at detecting AI text, simple to use and free for 10,000 characters. Fast and allows for file upload as well. I've never needed to use support since the process is easy. When you paste the text it opens in another browser tab to process, this is annoying. When we check customer feedback and reviews we use this tool to help ascertain the genuineness of the informationâ
âSeems to be a scam They charged me over âŹ150, I donât have an account and any trial period was cancelled on time. Reported them to my credit card company and blocked my card.â
âThey combine the least accurate tool on the market with the absolutely worst support. In fact it's not short of a scam, I got overcharged by 60Euros (which is very easy to verify from their backend) but all I get from the support is gaslighting.. Do no put your credit card in this thing there are many better alternatives out thereâ
âU are scamer, you take money with your fake subscribement we canât stop i report you. Btw dont subscribe u are going to be scam â
8Reliabilitythin data · 6 mentions
âIt used to be reliable. But as of this month, it will say 100 percent human and other times 100 percent AI for the same text..â
âit is really weird! one of my essay which partly written and revised by claude passed by GPTzero detection with 0%! but it was flagged as 100% ai generated by turnitin. i used other ai detection tools and they all shows 0% as well. Currently it has been sent to integrity office. who can kindly tell me wtf happened? And any tips for this caseđđ? would be really appreciate!â
âIt literally doesn't, it kind of just has a 50-50 shot of saying AI generated or human, but it is so dumb that you can write a paper, give it to it, have it say "99%" human, then send it again without changing anything, and get "99% AI generated"â
âThis is probably one of the worst AI checkers I have utilized throughout my entire academic life. Not only does it constantly suffer from severe lag, inaccuracies, and intangibility, but it also actively punishes authentic students by weaponizing flawed metrics against honest, hard-earned writing. â
43Supportthin data · 7 mentions
âSuper toller Kundenservice hilfsbereit und sonst auch sehr zufrieden. Vielen lieben Dank fĂŒr alles â
âThey combine the least accurate tool on the market with the absolutely worst support. In fact it's not short of a scam, I got overcharged by 60Euros (which is very easy to verify from their backend) but all I get from the support is gaslighting.. Do no put your credit card in this thing there are many better alternatives out thereâ
âThe only thing zero about GPTZero is the customer service. And honestly, it doesn't even seem like they care if they get bad reviews or not. I had many questions, but foolishly signed up anyway and anytime I have questions... crickets.â
âGot Charged $23.99 after trial for gptzero.me monthly subscription â got nothing, no response to mails that I send eitherâ
63Ease of Use12 mentions
âOutil simple dâutilisation et rapide, mais malheureusement beaucoup trop imprĂ©cis dans sa dĂ©tection. AprĂšs plusieurs tests effectuĂ©s sur des textes entiĂšrement rĂ©digĂ©s par des humains, plusieurs rĂ©sultats indiquaient un score de 100 % IA. Lâoutil considĂ©rer Ă tort des phrases simples ou naturelles comme Ă©tant gĂ©nĂ©rĂ©es par IA, ce qui rend presque impossible lâobtention dâun texte reconnu comme « non IA ». â
âI had a highly unsatisfactory experience with the cancellation process for my subscription. It was incredibly difficult to navigate, and I ended up losing a significant amount of money. When I reached out to customer service to express my concerns, I received a response that was both cold and unhelpful ,no apologies or accountability were offered. I definitely do not recommend this website to anyone. Additionally, the website itself was misleading, highlighting incorrect information and providiâ
âI couldn't cancel my free trial. Every time I clicked on this option, I was forwarded to a page without any corner to proceed with the cancellation. This is too wrong to force you to continue with the subscription even if you want to cancel during the free trial. There are fairer ways to make money, such as offering a well-provided and useful service. This is not the case with this platform. â
âThe results from GPTZero is clear and transparent. The sentence-level highlights make it is easy to understand why something is flagged, not just that it is. It feels practical and trustworthy, especially for academic and professional use. One thing that I dislike about GPTZero is that it can sometimes be overly cautious and flag human-written text as AI-generated. This can be frustrating when you know the content is original. I also wish the free version allowed slightly larger text limits for â
70Trust derived from dimensions + predator detectionview math
A composite of the quality dimensions weighted by mention volume, then capped by predator / abuse-detection rules.
Reasoning
Watch & learn
Video content
YouTube
YOUTUBE1.3K viewsI Tested NEW HumanizeMyPaper Against STRICT AI Detectors | Best AI humaniser
Insights4UToday29 days ago
YOUTUBE501 viewsTIP Protocol vs GPTZero: The AI Detector Era Is Over. GPTZero Can't Do This.
TheAILabOrg22 days ago
YOUTUBE195 viewsTesting Rephrasy AI Humanizer Against GPTZero and Turnitin
patrick-gerard1 month ago
YOUTUBE105 viewsDoes Rephrasy Work in Portuguese? I Tested It on GPTZero and Turnitin
ovitorpio25 days ago
YOUTUBE62 viewsBittensor Subnet Ranked #1 AI Detector Over GPTZero
VenturaLabsMedia29 days ago
Capabilities
Key features
Content Detector
Analyzes text to estimate whether it was written by a human or AI
Plagiarism Checker
Scans text against sources to detect copied passages and flag originality issues
Detector
Identifies whether content was AI-generated by analyzing text or media signals
The honest take
What users love & flag
Distinct themes surfaced across 823 reviews from 3 sources â each grounded in real review text, ranked by how often it comes up.
Questions
Frequently asked
What is GPTZero?
GPTZero is an AI content detection tool that identifies AI-generated text from major language models with 99% accuracy. It's specifically designed for educators and institutions to maintain academic integrity by detecting content from ChatGPT, GPT-4, Gemini, Claude, and Llama models. The platform is trusted by over 10 million users in education.
Is GPTZero free to use?
Yes, GPTZero offers a free plan that includes 10,000 words per month, basic AI scanning, 3 free advanced scans, and 5 free AI highlights in the Chrome extension. For higher usage, Premium plans start at $12.99 monthly (billed annually) with 300,000 words, and Professional plans at $24.99 monthly with 500,000 words.
Which AI models can GPTZero detect?
GPTZero can detect content generated by multiple AI models including ChatGPT, GPT-4, Gemini, Claude, and Llama. Unlike many competitors that focus on single models, GPTZero's multi-model detection capability makes it more comprehensive for identifying various types of AI-generated content.
How does GPTZero show which parts of text are AI-generated?
GPTZero provides sentence-level detection with visual highlighting that shows specific phrases and sentences identified as AI-generated content. This is unique in the market as it's the only tool offering sentence-level AI detection with visual highlighting. Users receive percentage likelihood scores and can see exactly which parts of the text were flagged.
Does GPTZero work well for non-native English speakers?
Yes, GPTZero specifically addresses bias concerns for ESL learners and maintains only a 1% false positive rate for non-native English speakers. This makes it reliable for diverse educational environments where students may have varying English language backgrounds.
What integrations does GPTZero offer for schools?
GPTZero integrates with popular educational platforms including Canvas, Google Classroom, and Google Docs. It also offers a Chrome extension for easy access and LMS integration capabilities in the Professional plan, making it convenient for institutional use.
Can GPTZero process multiple documents at once?
Yes, GPTZero supports batch file processing that can scan up to 250 files at once, which is available in the Professional plan. This feature is particularly useful for educators and institutions that need to check multiple student submissions efficiently.
What other features does GPTZero include besides AI detection?
Beyond AI detection, GPTZero offers plagiarism checking to verify content originality, grammar verification tools, AI-powered writing feedback, and the ability to generate downloadable AI detection reports for institutional documentation. This makes it a comprehensive content analysis platform for educators.
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