GPTZero
Detects AI-written content from ChatGPT, Gemini, Claude and Llama, and verifies that writing is human.
By GPTZero · 4.5/5 Value-Position score (estimate)
Positioning guardrails
Best for
- Educators and academic-integrity teams at schools and universities (used in 3,500+ colleges)
- Publishers, editors and legal teams verifying that submitted writing is human-written
- Recruiters and hiring teams screening candidate-written material for AI generation
- Developers embedding AI detection into their own products through the GPTZero API
Ideal size: 1-500 (single classroom to full institution) people · School, university or content team formalizing AI-integrity review
Not for
- Teams needing a sanction-ready verdict - the vendor states no detector is 100% accurate and results should not be used to punish
- Organizations needing strong detection outside English, German, Portuguese, French and Spanish
- Buyers who want AI content generation rather than detection and originality checking
- Procurement teams that need published self-serve seat pricing - team and API pricing require contacting sales
Value metrics scorecard
Time-to-Value
Same day for a free scan
~1 days to first production value
Total Cost of Ownership
On request
Free tier plus per-seat Professional, Team and Enterprise subscriptions; annual billing saves 45%; developer API priced separately.
Implementation Friction
2/5
Engineering + admin effort required
Value-Position score
out of 5 · model estimate
Full cost breakdown
Mandatory implementation fee
None
Seat tiers
Free single-user tier; Team/Enterprise plans purchased in multiple seats with shared credits and unified billing.
Add-on costs
- Developer API is priced separately from the subscription plans (contact sales)
Company & support
Who is behind GPTZero, and how your team gets help once it is live.
Company
- Founded
- 2023 · 3 yrs in business
- Headquarters
- Not recorded
How you get support
- PhoneNot listed
- EmailNot listed
- Live chatNot listed
- Support portal / ticketsNot listed
- Community forumNot listed
- Help centre / docsAll plans
- Dedicated account managerNot listed
- In person / on-siteNot listed
- Hours
- Not recorded
- Response time
- Not stated
Self-serve support centre with articles covering general detection, API, Chrome extension, account/billing and the Microsoft Word add-in. No published support hours, SLA or phone/chat contacts.
“Not listed” means the vendor’s public pages don’t mention that channel, not that it is unavailable. Ask about it during evaluation.
Market position
Where GPTZero sits against its closest alternatives. Pick any two of cost, speed, friction and buyer score, and up to 9 companies to compare.
Quadrant view
Typical annual cost × Time-to-value
The lines cross at the median of the solutions shown, so about half sit on each side of each line.
Companies on the chart 6 / 10
- GPTZero
- usecure
- Clever
- Abnormal
- Axcient
- Harmonic Security
Add or change companies
Up to 10 companies including GPTZero. Listed closest first.
Stack fit signal
Compatibility with standard B2B ecosystems.
No supported MCP path today, so it cannot be driven from an AI client.
AI & MCP readiness
What GPTZero ships in AI, and what it asks of your ecosystem.
AI features shipped
GPTZero is itself an AI detector built on a proprietary, self-trained model, and offers an AI Tutor for writing feedback. The vendor publishes nothing about model providers it runs on, customer-supplied keys, or per-action AI audit logging, and no MCP server is documented.
Your data & models
- Trains on your data
- Not recorded — ask the vendor
- Runs on
- Its own models
- AI pricing
- Not recorded
In your ecosystem
- AI connection
- Not supported
- Model key
- Not recorded
- AI usage audit
- Not recorded
Compliance attestations
* IAPP AIGP certifies individuals, not products. It means named staff hold the credential — not that the platform does.
Bottom line
GPTZero is an AI-detection and writing-integrity platform used by 17M+ users and 1M+ educators. It flags text from ChatGPT, Gemini, Claude and Llama, highlights the AI-generated passages, adds plagiarism checking, and can replay a document's writing process to prove human authorship. It is self-serve through the web app, Chrome extension, Google Docs/Classroom, Canvas and a developer API. Vendor-published accuracy is about 99%, but GPTZero warns no detector is perfect and results should not be a sole verdict.
Frequently asked questions
How accurate is GPTZero, and can it be the final verdict in an integrity case?
The vendor claims 99% accuracy and says independent work, including Penn State's AI research lab and the RAID benchmark, put it first: 95.7% of AI text detected while only 1% of human text was misclassified, rising above 99% for modern models like GPT-4. GPTZero also publishes its own limits: no detector is 100% accurate, longer documents score better than short passages, and results should not be used to punish anyone or as a final verdict. Treat it as evidence for a human conversation, not an automated sanction.
What does GPTZero cost?
There is a free tier: the web checker and the Google Docs add-in are free, and the Chrome extension gives automatic detection. Paid individual, team and enterprise plans are sold per seat, with annual billing saving 45% versus monthly; team plans add shared credits and unified billing. The public pricing page does not show dollar amounts and routes team and enterprise buyers to sales. The developer API is priced separately from the plans, so budget a per-seat subscription plus API usage.
Which systems does GPTZero plug into?
Out of the box it covers a Chrome extension, Google Docs, Google Classroom, Canvas, a Microsoft Word add-in, Zapier and a REST API with ready-to-use sample code in 17 languages. There is no documented native integration with Salesforce, Snowflake, SAP, Slack or cloud marketplaces, and nothing is published about an MCP server, so anything else means an API-based build.
Is GPTZero suitable for an institutional data-protection review?
GPTZero states it is AICPA SOC 2 Type II compliant, with independent audits, regular penetration testing and continuous monitoring. It also states compliance with FERPA, GDPR and CCPA and says it has completed HECVAT assessments and VPAT accessibility documentation for IT reviews. Those claims appear on product and integration pages rather than a dedicated trust centre, and the vendor has not published whether customer writing is used to train its models - confirm both in writing during procurement.
Which AI models and languages does GPTZero cover?
The vendor says detection works across ChatGPT, GPT-3/4/5/6, Gemini, Claude, Llama, DeepSeek and services built on those models, and that recent training data was refreshed with GPT-4.1, o3, Gemini 2.5 and Claude Sonnet 4 documents. Full accuracy is claimed for English, German, Portuguese, French and Spanish; the tool is used in over 100 countries but other languages are not fully supported. It also claims 96.5% accuracy on mixed human-and-AI documents.