GPTZero review (2026): is it worth it?
AI-writing detector with plagiarism, writing replay and an API
Black Friday: is there a GPTZero sale?
GPTZero report card
Fair · out of 4.0 · graded Nov 13, 2026
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.
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 GPTZero 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
Why GPTZero gets a 2.4
Five grades, each with its reason. The GPA is their average: an A is 4 points, an F is none.
- CValue for moneyNo single US dollar list price could be read, and prices vary by region. Left in the middle of the category.
- CFree plan and trialA free plan up to 10,000 words a month, which a regular user will hit.
- BFeaturesAI detection, writing replay, plagiarism, grammar feedback, a hallucination checker and an API. Nothing in the listing shows a gap in the core job.
- CEase of useNo store rating on record. You make an account and connect it to Docs or a class system.
- BPlatforms and integrationsWeb and a Chrome extension, with Google Docs, Canvas, Google Classroom, Gmail and an API.
What these grades rest on. 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. How we review and grade.
Make GPTZero? Put this grade on your site
Paste this where you want the badge. It links here and follows the grade if it changes. About badges
<a href="https://toolgpa.com/tools/gptzero#review"><img src="https://toolgpa.com/badge/gptzero.svg" alt="GPTZero: 2.4 GPA on ToolGPA" width="196" height="56"></a>Where GPTZero stands among writing tools
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, level with 50
- CFree plan and trialAbove 19 of 136, level with 71
- BFeaturesAbove 94 of 136, level with 40
- CEase of useAbove 7 of 136, level with 81
- BPlatforms and integrationsAbove 71 of 136, level with 56
Keep GPTZero, or make your own?
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.
What is GPTZero?
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.
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.
Key features
- 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.
GPTZero pricing
We could not confirm GPTZero’s current pricing from its own site, so we are not listing plans here. See gptzero.me for current prices.
Works with
GPTZero alternatives
- GPTZero vs Originality.ai
Free plan · from $12.95/mo
- GPTZero vs Winston AI
Free trial · from $10/mo
- GPTZero vs Pangram
Free plan · from $15/mo
- GPTZero vs Grammarly
Free plan · from $12/mo
Common questions
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.
Sources for this page
The prices, plans, platforms and features above were read from these pages on Nov 13, 2026.