GPTZero Pricing (2026): Free, Premium and Professional
GPTZero has a free plan and two paid plans for individuals. Free scans 10,000 words a month. Premium costs $23.99 a month, or $12.99 a month billed yearly ($155.88), and is the plan most teachers and writers need: 300,000 words, plagiarism checks and detection of humanized AI text. Professional costs $45.99 a month, or $24.99 billed yearly ($299.88), and adds 500,000 words, bigger scans and Canvas and Google Classroom integration.
Teams buy Professional seats for each member, schools can ask for a contract, and developers pay separately for the API, from $45 a month for 300,000 words. These are US prices from GPTZero's pricing page in September 2026; GPTZero shows prices in local currency in other countries.
Prices checked 25 September 2026 on GPTZero's official pricing page. Prices are in US dollars unless stated and can change at any time.
GPTZero plans and prices
Free
- 10,000 words a month
- Up to 10,000 characters per scan; up to 3 files per batch
- AI, human and mixed classification with sentence highlights
- One free Advanced Scan and a grammar check
- No plagiarism checker or downloadable reports
- No paraphraser or AI bypasser detection
- No AI Vocabulary scan
Premium
- 300,000 words a month
- Up to 50,000 characters per scan; up to 50 files per batch
- Unlimited Advanced Scan and AI Vocabulary scan
- Paraphraser and AI bypasser detection
- Plagiarism checker and downloadable AI reports
- Writing feedback, source finding and auto-generated citations
- No LMS integration or team admin
- No page-by-page scanning
Professional
- 500,000 words a month
- Up to 150,000 characters per scan; up to 250 files per batch
- Everything in Premium, plus page-by-page scanning
- Canvas and Google Classroom integration
- Roles, account provisioning and shared billing for teams
API
- Tiers of 300,000 words ($45) up to 20 million words ($1,850) a month
- Document labels, probabilities, confidence and sentence highlights
- Documents sent through the API are not stored, GPTZero says
- Limited free testing in the API docs without a key
- Overage is charged past your word allowance, up to 1 million extra words before you must upgrade
Schools and enterprise
- Multiple seats with shared credits and central billing
- LMS integration and single sign-on setup
- Option of a formal contract
- Site-wide prices are not published
Is there a free plan?
Yes, GPTZero is free for up to 10,000 words a month. That is enough for about five 2,000-word essays. Each scan can hold up to 10,000 characters, roughly 1,500 words of English, so long papers need splitting or a paid plan.
The free plan gives the core detector: an overall verdict (human, AI or mixed), a confidence level and highlighted sentences, plus one Advanced Scan and a grammar check. It does not include the plagiarism checker, downloadable reports or detection of text run through paraphrasers and humanizers. Those need Premium.
What you will actually pay
Worked examples using the published prices above.
| Scenario | Cost | How we got there |
|---|---|---|
| Student checking a few essays a month | $0 | 10,000 free words a month covers about five 2,000-word essays. |
| Teacher checking 150 essays of 1,000 words each month | $155.88/year on Premium | 150 × 1,000 = 150,000 words, within Premium's 300,000. Billed monthly: $23.99 × 12 = $287.88. |
| Department of 5 teachers on Professional | $1,499.40/year | 5 seats × $299.88 billed yearly. Billed monthly: 5 × $45.99 × 12 = $2,759.40. |
| App scanning 1 million words a month via the API | $1,620/year | $135 a month for the 1 million-word tier × 12. |
GPTZero pricing compared with rivals
| Tool | Paid plans from | Free plan | Note |
|---|---|---|---|
| GPTZero | $12.99/month billed yearly (Premium); $23.99 monthly | Yes: 10,000 words a month | The tool on this page |
| Pangram | $20/month (Individual); $180 billed yearly | Yes: 2,000 words a day | Top result in independent tests. Individual covers 300,000 words with plagiarism checks. |
| Originality.ai | $12.95/month billed yearly; $14.95 monthly | Yes: 3 scans a day up to 2,000 words each | 2,000 credits a month; 1 credit = 100 words per check type. Credits expire monthly. |
| QuillBot | $8.33/month billed yearly (Premium); $19.95 monthly | Yes: AI detector up to 1,200 words per scan, 6 scans a day | Premium removes detector limits and adds paraphrasing and plagiarism tools. |
| Grammarly | $12/month billed yearly (Pro); $30 monthly | Yes: free AI detector and basic plagiarism scan | Now owned by the same company as GPTZero. Pro adds the full plagiarism report. |
| Copyleaks | $13.99/month billed yearly; $16.99 monthly | No full free plan | 100 credits a month, about 25,000 words. Covers AI, plagiarism and code. |
| Turnitin | Institutional licence only | No; students use it through their school | Cannot be bought by individuals. AI detection is a paid add-on for institutions. |
The free plan is worth using, and Premium billed yearly is fair value for regular users. At $12.99 a month it costs less than most rivals' comparable plans and adds plagiarism checks, bypasser detection and 300,000 words.
- Students and occasional users: stay on Free. 10,000 words a month is plenty for checking your own essays.
- Teachers: Premium billed yearly covers about 300 essays of 1,000 words a month. Only move to Professional if you need Canvas or Google Classroom integration.
- Avoid monthly billing unless you need it for one term: it costs about 85% more over a year than paying yearly.
If catching disguised AI text matters most, compare Pangram first; it tested better in independent research and costs $20 a month. See all options on our GPTZero alternatives page.
GPTZero API pricing
The API lets developers send text to GPTZero from their own apps. It is billed monthly by word allowance, separately from dashboard plans:
| Monthly words | Price per month |
|---|---|
| 300,000 | $45 |
| 1 million | $135 |
| 2 million | $250 |
| 5 million | $550 |
| 10 million | $1,000 |
| 20 million | $1,850 |
US prices from GPTZero's plan data, captured 21 September 2026. Each request can hold up to 150,000 characters. GPTZero's help centre says you can go up to 1 million words over your tier, charged as overage, before you are asked to upgrade, and that you can try the API free in its docs for a limited number of calls.
Team, school and district plans
Teams buy Professional seats for each member and share credits and billing in one workspace. GPTZero's help centre says a school or department can buy multiple seats by card through its teams page, or sign a contract through sales. Site-wide and district prices are not published.
If your school already pays for Turnitin, check whether its AI add-on is licensed before buying GPTZero seats, and read our AI detectors for teachers ranking to compare classroom features.
- Pay yearly if you will use GPTZero for more than about seven months: Premium yearly ($155.88) costs less than seven months of monthly billing ($167.93).
- Need GPTZero for one exam season only? Buy a monthly plan and use GPTZero's pause option (one to three months) rather than cancelling and re-subscribing.
- Split long documents only at natural breaks. The free plan's 10,000-character scan limit can cut a paper mid-argument and weaken the result.
- Teachers should try the free plan and Chrome extension for a few weeks before paying, and check which Writing Report features each plan includes.
- Cancel in your subscription settings before the renewal date and keep the confirmation email, since billing complaints are common in public reviews.
Jargon explained
- False positive
- When a detector wrongly says human writing was produced by AI.
- False negative
- When a detector misses AI-written text and calls it human.
- Humanizer (AI bypasser)
- A tool that rewrites chatbot text so it looks human and slips past detectors.
- Writing replay
- A playback of how a document was typed, edited and pasted, used as evidence of who wrote it.
- Confidence category
- GPTZero's label for how sure it is about a verdict: high, moderate or uncertain.
Frequently asked questions
How much does GPTZero cost?
Free costs $0 for 10,000 words a month. Premium is $23.99 a month or $12.99 a month billed yearly ($155.88). Professional is $45.99 a month or $24.99 billed yearly ($299.88). API plans start at $45 a month. US prices checked September 2026.
Is GPTZero free?
Yes. The free plan scans 10,000 words a month with sentence highlights. It leaves out plagiarism checks, downloadable reports and humanizer detection.
What happened to the GPTZero Essential plan?
GPTZero's current pricing page shows only Free, Premium and Professional for individuals. Essential, a cheaper 150,000-word tier, no longer appears there. Existing subscribers should check their billing settings.
Does GPTZero have a teacher or school discount?
GPTZero sells team seats and school contracts but does not publish a teacher discount. Schools can contact sales for a site-wide quote.
Can I cancel GPTZero anytime?
Yes, from your subscription settings. You can also pause for one, two or three months. GPTZero's help centre says refund requests are reviewed case by case.
Sources
Every fact on this page comes from public information. Vendor figures are labelled as vendor claims.
- GPTZero pricing (GPTZero)
- GPTZero plan data (US, captured 21 September 2026) (Internet Archive)
- GPTZero homepage (GPTZero)
- GPTZero technology and benchmarking (GPTZero)
- GPTZero for educators (GPTZero)
- What are the limitations of GPTZero's AI classifier? (GPTZero Support Center)
- What languages does GPTZero support? (GPTZero Support Center)
- What happens if I go over the number of words limit of my plan? (GPTZero Support Center)
- Are you storing data from API calls? (GPTZero Support Center)
- Can I purchase a license for my school or department? (GPTZero Support Center)
- How can I pause my subscription? (GPTZero Support Center)
- Artificial Writing and Automated Detection (Jabarian & Imas, 2025) (Becker Friedman Institute, University of Chicago)
- GPT detectors are biased against non-native English writers (Liang et al., 2023) (arXiv / Patterns)
- GPTZero: Robust Detection of LLM-Generated Texts (arXiv)
- Superhuman has acquired AI authenticity service GPTZero (Engadget)
- GPTZero (Wikipedia)
- GPTZero: AI Detection & Writing Replay (Chrome Web Store)
- GPTZero reviews (Trustpilot)
- Pangram pricing (Pangram Labs)
- Originality.ai pricing (Originality.ai)
- QuillBot AI Detector (QuillBot)
- QuillBot Premium (QuillBot)
- Grammarly AI Detector (Superhuman (Grammarly))
- Copyleaks pricing (Copyleaks)
- Turnitin's AI writing detection capabilities FAQs (Turnitin Guides)