GPTZero
Most accurate AI detector for educators, writers, and professionals
GPTZero remains the go-to AI detector for educators, offering the most accurate detection and unique tools like hallucination detection and authorship verification. Its free tier is restrictive, and no detector is perfect—false positives happen. Use it as part of a holistic assessment strategy, not a silver bullet.
- Teachers and educators fostering academic integrity in the classroom
- Writers and authors proving human authorship and avoiding false AI claims
- Students improving writing skills and avoiding false accusations
- Recruiters screening for human-written applications
- Users needing a free, unlimited AI detection tool (free tier caps at 10k characters)
- Developers looking for low-cost, self-serve API pricing (custom sales only)
- Organizations requiring completely false-positive-free detection (no detector is perfect)
We scan live Reddit threads, YouTube comments, X posts, G2 reviews and other communities — and hand you an honest verdict in under a minute.
- Honest verdict, not marketing
- Real pros & cons from real users
- Attributed quotes with receipts
3 free scans · no card needed
Skip GPTZero if you need a free, unlimited AI detector or require completely false-positive-free detection.
Free tier limited to 10,000 characters per scan; frequent users must upgrade to a paid plan.
GPTZero's pricing is educator-friendly with a free tier for basic detection and a Professional plan at $16.49/mo annually. This is cheaper than Originality.ai's $14.95/mo basic plan but offers more features. For teams, contact-sales pricing may be higher than Turnitin's institutional licensing. Best for schools and individual pros, less competitive for enterprise-scale deployments.
In short
GPTZero — Most accurate AI detector for educators, writers, and professionals. Best for Teachers and educators fostering academic integrity in the classroom, Writers and authors proving human authorship and avoiding false AI claims, Students improving writing skills and avoiding false accusations. Free to start; paid plans from $16.49197/mo.
What's new in GPTZero
Checked todayAcross the latest 5 updates: 1 feature update and 4 news mentions.
What is Narrative Writing? A Guide
Blog post explaining narrative writing concepts and tips, not directly about AI detection.
Prepositions: Definition, Types, and Examples
Grammar guide on prepositions, not directly about AI detection.
Teaching With AI Around the World: A Q&A with Gavin Doyle in Ireland
Interview with educator on AI in classrooms; touches on AI detection use.
How AP Verify is helping to combat misinformation with GPTZero
AP Verify integrates GPTZero for AI text detection in their media verification workflow.
¿Por qué mis textos se marcan como IA (cuando no lo son)?
Spanish article explaining false positives in AI detection and how patterns differ from intent.
Viability Score
How likely is GPTZero to still be operational in 12 months? Based on 4 signals — momentum (how recently it shipped), wrapper dependency, revenue model, and web presence.
Last calculated: July 2026
How we score →Key Features
- AI detection for ChatGPT, GPT-5, Gemini, Claude, Llama
- Advanced AI Scan with per-sentence probability breakdown
- Hallucination Detector for fake citations
- Plagiarism Checker for copied content
- Grammar Checker for spelling and grammar errors
- AI Vocabulary to identify common AI words
- Authorship Verification with video replay
- AI Tutor for custom AI-powered writing feedback
- AI Reviewer for faster grading feedback
- Expert Feedback trained by domain experts
- AI Vision browser extension for real-time detection
- Writing report to prove authentic voice and process
- Autotyper Detection in Writing Replay
- Canvas and Google Classroom integration
- API for custom AI detection workflows
About GPTZero
GPTZero is the leading AI detection platform designed for educators, writers, and professionals who need to identify AI-generated text from models like ChatGPT, GPT-5, Gemini, Claude, and Llama. Trusted by over 17 million users and 1 million educators, GPTZero claims 99% accuracy in spotting AI content while minimizing false positives. Beyond detection, its suite includes advanced features such as an Advanced AI Scan with per-sentence probability breakdowns, a Hallucination Detector to catch fake citations, a Plagiarism Checker, Grammar Checker, Authorship Verification with video replay, and an AI Tutor for custom writing feedback. The tool integrates with Chrome, Google Docs, Canvas, Google Classroom, and Zapier, and offers an API. Best for teachers fostering academic integrity and writers proving authorship, GPTZero differentiates with its hallucination detection and writing replay features. Its free tier is limited to 10,000 characters. Compared to alternatives like Originality.ai or Turnitin, GPTZero's unique focus on authorship verification and AI tutor makes it a comprehensive integrity solution.
Behind the Verdict
GPTZero is the most reliable AI detector we've tested for academic settings. Its Advanced AI Scan gives per-sentence probability scores, which helps teachers understand why a passage was flagged. The Hallucination Detector is a standout—almost no other tool catches fake citations. Authorship Verification with video replay is brilliant for proving a student actually wrote their essay over time. We'd reach for GPTZero when we need to investigate suspicious work with evidence, not just a score. Where it bites: the free tier's 10,000-character limit is too low for long essays, forcing upgrades. False positives remain an issue with any detector; GPTZero misclassifies some human-written text, especially predictable genres like legal briefs or technical reports. Compared to Turnitin, GPTZero offers more granularity and the unique hallucination check, but Turnitin integrates deeper into LMS workflows. Originality.ai is better for publishers and content mills with its bulk scanning; GPTZero is built for education first. Real-world caveat: use GPTZero as part of a conversation, not a verdict. Show students the report and discuss it—that's where the tool shines.
Researching GPTZero? Get your full AI stack in 60 seconds.
Free, no signup — tell us your goal and get tools matched to your budget & existing stack.
Real-world workflow fit
Concrete scenarios for the personas GPTZero actually fits — and what changes day-one when you adopt it.
Grade student essays submitted via Google Classroom.
Outcome: Paste text into GPTZero, get a per-sentence AI probability report, and share feedback via AI Reviewer to maintain academic integrity.
Submit an article to a publisher that requires a human-written guarantee.
Outcome: Use Authorship Verification with video replay to generate a writing report proving your process, ensuring acceptance.
Screen incoming emails for AI-generated phishing content.
Outcome: Use GPTZero API to automatically analyze email text and flag potential AI-written attacks, reducing risk.
Use Cases
- Scan student essays for AI-generated content before grading.
- Verify citations in research papers to detect hallucinated references.
- Prove your writing is human when submitting to plagiarism-conscious publishers.
- Integrate API into a recruitment platform to screen candidate responses.
- Use Zapier to automatically check AI-generated content in your CMS.
- Monitor AI usage across an institution with admin dashboard data.
- Analyze AI-generated phishing emails in cybersecurity workflows.
- Train ML models by filtering out AI-generated training data.
Models Under the Hood
as of 2026-07-06
Limitations
- Free scans are limited to 10,000 characters per scan.
- Advanced Scan and other features require a paid plan.
- Accuracy on heavily paraphrased or adversarial AI text is lower.
- The tool is primarily trained on English text and may perform poorly on other languages.
as of 2026-07-02
12-month cost
Project the real annual outlay, including the implied monthly cost when only an annual tier is published.
Vendor list price only. Add-on usage, seat overages, and contract minimums are surfaced under Hidden costs & gotchas.
Plans compared
For each published GPTZero tier: who it actually fits, and what it adds vs. the previous tier. Cross-reference the cost calculator above for projected annual outlay.
Free
$0/mo
Ideal for
Individual educators or students who need occasional AI detection for short documents (under 10,000 characters).
What this tier adds
Free entry point with basic AI detection, grammar checker, and AI vocabulary but limited to 10k characters per scan.
Professional (Annual)
$16.49/mo (billed annually at $197.88)
Ideal for
Full-time educators or freelance writers who need unlimited scanning and advanced features like hallucination detection and authorship verification.
What this tier adds
Adds unlimited scanning, Advanced AI Scan, Hallucination Detector, Plagiarism Checker, Authorship Verification, AI Tutor, and priority support at a 45% discount vs monthly.
Professional (Monthly)
$29.99/mo
Ideal for
Users who need professional features but prefer month-to-month billing without annual commitment.
What this tier adds
Same features as annual plan but billed monthly at $29.99/mo instead of $16.49/mo.
Enterprise/Team
Contact sales
Ideal for
Schools, universities, or organizations needing multiple seats, shared credits, and admin controls.
What this tier adds
Adds multiple seats, shared team credits, unified billing, admin dashboard, custom integrations, and dedicated support. Requires contacting sales.
API
Custom
Ideal for
Developers and companies integrating AI detection into their own platforms with custom rate limits.
What this tier adds
Provides programmatic access with 17 language SDKs, custom rate limits, and enterprise-grade accuracy. Custom pricing via sales.
Where the pricing makes sense
The company stage and team size where GPTZero's pricing actually pencils out — and where peers do it cheaper.
GPTZero's pricing is educator-friendly with a free tier for basic detection and a Professional plan at $16.49/mo annually. This is cheaper than Originality.ai's $14.95/mo basic plan but offers more features. For teams, contact-sales pricing may be higher than Turnitin's institutional licensing. Best for schools and individual pros, less competitive for enterprise-scale deployments.
Setup time & first value
How long it actually takes to get something useful out of GPTZero — broken out by persona, not the marketing-page minute.
For individuals: paste text and scan instantly. For classroom integration: installing the Chrome extension takes under 2 minutes; connecting Canvas/Google Classroom requires a few clicks and login. API integration may take a few hours depending on development environment.
Switching to or from GPTZero
How to bring data in from common predecessors and how to get it back out — written for the switcher, not the buyer.
- →From Originality.ai: export your scan history (if available), start using GPTZero's free tier, then upgrade for hallucination detection and authorship verification.
- →From Turnitin: GPTZero offers a similar AI detection feature set with additional tools like AI Tutor and Authorship Verification at potentially lower cost for individuals.
- ↗To Originality.ai: export detection history, switch if you need a more generous free tier or team collaboration features.
- ↗To Sapling AI Detector: if you require a simpler interface with lower cost and don't need advanced features like video replay.
Integrations
Resources & Guides
- Resourcegptzero.me
GPTZero
The World's #1 AI Content Detector with over 8 Million Users
- Resourcegptzero.me
GPTZero
The World's #1 AI Content Detector with over 8 Million Users
- Resourcegptzero.me
GPTZero
The World's #1 AI Content Detector with over 8 Million Users
- Resourcegptzero.me
GPTZero
The World's #1 AI Content Detector with over 8 Million Users
- Resourcegptzero.me
GPTZero
The World's #1 AI Content Detector with over 8 Million Users
Official links
Tools that pair well with GPTZero
Common stack mates teams adopt alongside GPTZero, with the specific reason each pairing earns its keep.
Alternatives to GPTZero
View allFrequently Asked Questions
Categories
Best-of guides
Used GPTZero? Help shape our editorial sentiment research.