The GPTZero Insider’s Guide
Everything we know about GPTZero in one document: what it costs, its grades, getting a refund, getting help and what else to look at. Read it here, or keep a copy.
GPTZero
The Insider’s Guide
AI-writing detector with plagiarism, writing replay and an API
Every plan, grade, refund rule and rival among writing tools, read from GPTZero’s own pages.
Made by GPTZero · checked Nov 13, 2026 · toolgpa.com
Contents
- 01WelcomeWhat it is, who it suits, its grades and the ten things to know first
- 02What it costsEvery plan, the free plan, ways to pay less and how prices have moved
- 03What it doesIts main features, where it runs, what it works with and who makes it
- 04Where it standsIts grades against its category, and whether to keep it or make your own
- 05The alternativesThe tools it is most often weighed against, side by side
- 06Quick answersThe questions people ask about it, each answered in a line or two
- 07About ToolGPAWho made this guide, what else is on the site, and how to cite it
ToolGPA put this guide together from GPTZero’s own pages, its app-store listings and our grades. Every fact in it is on GPTZero’s page too, where it is kept up to date. Checked Nov 13, 2026.
Part 01 · Overview
Welcome
What it is, who it suits, its grades and the ten things to know first
2.4
GPA, above 59 of the 136 other writing tools we grade
GPTZero checks whether text was written by AI and says it covers output from ChatGPT, Claude, Gemini and Llama. It also offers a plagiarism checker, writing feedback, a hallucination detector and a Chrome extension that records a Google Docs writing replay. It is aimed at educators, students and teams, with a free plan, paid individual plans, team seats and an API.
To get you started, here are 8 things to know about GPTZero, taken from its own pages and our grades.
You make an account and connect it to Docs or a class system.
- 1
Best for checking whether text looks AI-written
GPTZero checks text for AI writing and adds plagiarism checks, a writing replay in Google Docs and an API.
- 2
There is a free plan
Free plan covering up to 10,000 words per month, according to the vendor's pricing FAQ.
- 3
It runs on Web
Web, with a browser extension too.
- 4
AI detection
Classifies text from models such as ChatGPT, Claude, Gemini and Llama; an Advanced Scan shows how different sentences score.
- 5
Writing replay in Google Docs
The Chrome extension records a replay of a document being written, including copy and pastes and unusual typing patterns.
- 6
Plagiarism checker
Checks whether content was copied from outside sources without attribution.
- 7
A 2.4 GPA, above 59 of 136
That is against the other writing tools we grade, on value, the free plan, features, ease of use and platforms.
- 8
Keep it
Nothing GPTZero does is plain enough to make in a weekend. The 4 things listed below take a company.
GPTZero at a glance
- Pricing
- Free plan
- Free plan
- Yes
- Free trial
- None stated
- Runs on
- Web, Browser extension
- Made by
- GPTZero
- Category
- Writing Tools
- Our grade
- 2.4 GPA, fair
The report card
Best for checking whether text looks AI-written
GPTZero checks text for AI writing and adds plagiarism checks, a writing replay in Google Docs and an API. A free plan stops at 10,000 words a month, paid prices vary by region and couldn't be read as one dollar figure, and the API is priced apart.
| Subject | Grade | Comment |
|---|---|---|
| Value for money | C | No single US dollar list price could be read, and prices vary by region. Left in the middle of the category. |
| Free plan and trial | C | A free plan up to 10,000 words a month, which a regular user will hit. |
| Features | B | AI detection, writing replay, plagiarism, grammar feedback, a hallucination checker and an API. Nothing in the listing shows a gap in the core job. |
| Ease of use | C | No store rating on record. You make an account and connect it to Docs or a class system. |
| Platforms and integrations | B | Web and a Chrome extension, with Google Docs, Canvas, Google Classroom, Gmail and an API. |
An A is worth 4 points, a B 3, a C 2, a D 1 and an F nothing. The GPA is the average of the five.
Who GPTZero is for
- Fits if you grade or review writing and want to check it for AI
- Works for teachers whose classes run on Canvas or Google Classroom
Who it is not for
- Tight if you check a lot: the free plan stops at 10,000 words a month
- Skip it if you want one clear price, because paid prices vary by region and by test
- Pricey if you want a team: two-seat minimum, and the API is priced separately
- Watch out: the vendor's own wording suggests a detector is a guide, not proof
Good to know
Good for
- Teachers checking student work for AI use
- Students who want a writing replay as proof of authorship
- Teams that scan many documents and want shared seats
Worth knowing
- Paid individual plan prices vary by region and by test; no single US dollar list price could be read.
- The free plan stops at 10,000 words a month.
- The team plan has a two-seat minimum and gives 500,000 words per member each month.
- The API is priced separately from the individual and team plans.
Part 02 · Pricing
What it costs
Every plan, the free plan, ways to pay less and how prices have moved
GPTZero's current pricing could not be confirmed from its own site.
No single US dollar list price could be read, and prices vary by region.
We could not confirm GPTZero’s current prices from its own site, so this guide lists no plans. gptzero.me has them.
Part 03 · Features
What it does
Its main features, where it runs, what it works with and who makes it
2
Places it runs: Web and Browser extension
AI-writing detector with plagiarism, writing replay and an API. Here is what it does, as its own site describes it, and what it covers: public API, AI features, grammar & style.
AI detection, writing replay, plagiarism, grammar feedback, a hallucination checker and an API.
- AI detection
- Classifies text from models such as ChatGPT, Claude, Gemini and Llama; an Advanced Scan shows how different sentences score.
- Writing replay in Google Docs
- The Chrome extension records a replay of a document being written, including copy and pastes and unusual typing patterns.
- Plagiarism checker
- Checks whether content was copied from outside sources without attribution.
- Writing feedback and grammar check
- Gives feedback on clarity, tone and wordiness beyond a basic grammar check.
- Hallucination detector
- A separate checker aimed at hallucinated content in AI-written text, listed beside the AI detector.
- Classroom and API integrations
- Connects to Canvas and Google Classroom, and offers an API with code samples in 17 languages.
Where it runs
- Web
- Browser extension
What it works with
- Google Docs
- Canvas
- Google Classroom
- Gmail
- Chrome
GPTZero is made by GPTZero.
Part 04 · Standing
Where it stands
Its grades against its category, and whether to keep it or make your own
59/136
Other writing tools it is graded above
GPTZero's GPA of 2.4 is higher than 59 of the 136 other writing tools we grade, and level with 16.
It stands best on features (B, above 94 of 136) and worst on ease of use (C, above 7).
Each grade against the category
Every bar is all 137 writing tools we grade, cut by the letter each got. GPTZero’s own letter is outlined.
- CValue for moneyAbove 22 of 136
- CFree plan and trialAbove 19 of 136
- BFeaturesAbove 94 of 136
- CEase of useAbove 7 of 136
- BPlatforms and integrationsAbove 71 of 136
Keep it, or make your own?
Whether this is something you could build for yourself with an AI app builder, and what you would give up.
Keep it
Nothing GPTZero does is plain enough to make in a weekend. The 4 things listed below take a company.
What you could not
- Grammar checking as you type, wherever you type.
- It plugs into other products, Google Docs, Canvas and Google Classroom among them, and has an API.
- AI features, unless you pay a model provider for each request yourself.
- The depth: we grade its features B, which means it covers the whole job.
What this rests on. GPTZero’s listing: what it does, where it runs, what it plugs into and what it costs. It is a judgement about the kind of software this is. We have not built a replacement for it, and making your own means looking after it too. How we decide, and every tool’s verdict.
Part 05 · Alternatives
The alternatives
The tools it is most often weighed against, side by side
Originality.ai, Winston AI, Pangram and Grammarly
The 4 tools GPTZero is most often weighed against, with where each one differs from it.
- 2.4GPA
Originality.ai
Free plan · from $12.95/mo
AI-content and plagiarism checker with a Chrome extension and API.
- Originality.ai also covers reports.
- 2.4GPA
Winston AI
Free trial · from $10/mo
AI text and image detector with a plagiarism checker.
- GPTZero has a free plan. Winston AI does not, though it has a free trial.
- 2.6GPA
Pangram
Free plan · from $15/mo
Detects AI-written text and images, with a free daily allowance.
- GPTZero also covers grammar & style.
- 3.0GPA
Grammarly
Free plan · from $12/mo
Writing assistant for grammar, tone and rewrites in any app.
- Only Grammarly lists macOS, Windows, iOS and Android apps.
- Grammarly also covers AI agents, citations and documents.
Part 06 · Questions
Quick answers
The questions people ask about it, each answered in a line or two
11
Questions, each answered in a line or two
The short version of everything above, for when you only need the answer. Each one is told in full in its part of the guide.
Is GPTZero free?
GPTZero has a free plan. Free plan covering up to 10,000 words per month, according to the vendor's pricing FAQ.
What platforms does GPTZero work on?
GPTZero is available on Web. It also has a browser extension.
Does GPTZero have an Android app?
No Android app was listed when its pages were read on Nov 13, 2026. GPTZero is listed for Web.
Does GPTZero have an iPhone app?
No iPhone app was listed when its pages were read on Nov 13, 2026. GPTZero is listed for Web.
Is GPTZero open source?
GPTZero is not described as open source on its own site, as read on Nov 13, 2026.
Does GPTZero have an API?
Yes. GPTZero offers a public API, according to its own site.
What does GPTZero integrate with?
GPTZero's listing names Google Docs, Canvas, Google Classroom, Gmail and Chrome.
Who makes GPTZero?
GPTZero is made by a company of the same name.
What are the alternatives to GPTZero?
The closest alternatives to GPTZero in our directory are Originality.ai, Winston AI, Pangram and Grammarly.
How does GPTZero compare with other writing tools?
GPTZero's GPA of 2.4 is higher than 59 of the 136 other writing tools we grade, and level with 16.
Could I make my own version of GPTZero?
Nothing GPTZero does is plain enough to make in a weekend. The 4 things listed below take a company.
Where this guide comes from
The prices, plans, platforms and features were read from GPTZero’s own pages on Nov 13, 2026, and the grades were given on Nov 13, 2026. Graded from this listing, whose facts were read from GPTZero's own pages on 13 November 2026. Not based on using the product, and shorter than our full reviews.
Every tool we list gets five grades, A to F, each with its reason, and a GPA that averages them. How each is decided is at toolgpa.com/grades. This guide is ToolGPA’s own work; it is not made, paid for or approved by GPTZero. Prices change, so check gptzero.me before you buy.
Part 07 · About
About ToolGPA
Who made this guide, what else is on the site, and how to cite it
7,721
Tools graded, in 95 categories
ToolGPA grades software the way a school report grades a pupil: five subjects, a letter for each with the reason written beside it, and a GPA that averages them. Prices, plans and platforms are read from each maker’s own pages and dated, so you always know how fresh a figure is.
Every grade, review and ranking on ToolGPA is our own judgement. No company can pay for a grade or change one. Every tool on the site has a guide like this one, free to download and pass on. It all lives at toolgpa.com.
7,721
tools graded
95
categories
739
price changes on record
579
apps priced in 12 countries
What else is on toolgpa.com
- GPTZero, kept up to dateEverything in this guide, with prices and grades as they are todaytoolgpa.com/tools/gptzero
- How grades are givenThe rules behind every letter and every GPAtoolgpa.com/grades
- Value chartsWhat each tool costs against what it scores, for every categorytoolgpa.com/charts
- CompareAny two tools side by side, plan by plantoolgpa.com/compare
- Price changesEvery price rise and cut on record, each with its sourcetoolgpa.com/price-changes
- Prices by countryWhat apps cost on the App Store in 12 countriestoolgpa.com/prices-by-country
- Pay lessEvery public discount: yearly billing, students, nonprofitstoolgpa.com/save
- Keep or makeWhich tools are worth paying for, and which you could build yourselftoolgpa.com/keep-or-make
Scan for the live page
Prices and grades as they are today
Quoting this guide?
Please name ToolGPA and link to the live page, so readers can check the figures for themselves:
ToolGPA, "GPTZero: The Insider's Guide", checked Nov 13, 2026. https://toolgpa.com/tools/gptzero
Know someone choosing between writing tools?
Send them this guide: toolgpa.com/tools/gptzero/guide
ToolGPA elsewhere: youtube.com/@toolgpa
See our other guides
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- Writing Tools Insider's GuideEvery one of the 137 writing tools we grade, compared
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- Microsoft Word Insider's GuideWord processor sold with Microsoft 365, free in the browser3.4 GPA
- Apache OpenOffice Insider's GuideFree open-source office suite with the Writer word processor3.2 GPA
Choosing software? Every tool graded, every price dated.
Compare tools at toolgpa.com ›Everything in this guide is ToolGPA’s own summary of what GPTZero’s pages, its app-store listings and public reviews said on the dates shown. Grades are our judgement under the rules at toolgpa.com/grades. Every grade, review and ranking on ToolGPA is our own judgement. No company can pay for a grade or change one. GPTZero is a trademark of its owner, and this guide is not made, paid for or approved by GPTZero. Prices and plans change: check gptzero.me before you buy.