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DetectGPT vs ZeroGPT: Two Public AI Checkers, Two Different Reports

September 7, 2026

If you needed a self-check tonight, DetectGPT is the free AI writing checker. DetectGPT and ZeroGPT sit in the same family of public AI writing checkers: paste a draft, get a percentage for how machine the prose looks, and leave without a school login. They are not the same product, and they will not print the same number.

People search the comparison because a teacher said GPTZero, a Reddit thread said ZeroGPT, and a classmate said Turnitin, as if those names were one detector. ZeroGPT is a public dashboard. GPTZero is another company. Turnitin® is the campus report. DetectGPT is the self-check on this site.

You can run more than one. Just do not screenshot one as proof against another. The useful move is to read the lines that look generated and rewrite them in a voice you can defend.

This piece covers what each tool is, how DetectGPT differs, where Turnitin fits, and when to use which box. Does Turnitin use GPTZero is the campus version of the same mix-up.

Check a draft on DetectGPT

If the draft came from ChatGPT, Claude, Grok, or Gemini, paste it here or drop in a public page URL and we'll score how much of it still sounds like a model, with a 3,000-word cap and no account in the way. We aren't Turnitin and we don't search a paper archive, so treat this as a self-check on rhythm rather than an official campus report.

Open the checker

At a glance

FactorQuick answer
DetectGPTFree AI writing checker at detectgpt.io, plus a plagiarism tab
ZeroGPTSeparate public AI detector, not this site
GPTZeroAnother company. Not ZeroGPT, not DetectGPT
Turnitin®Campus license. Students usually cannot open it themselves
Scores match?No
Best first stepThe checker you can actually paste into tonight

Two public boxes, not one brain

DetectGPT scores finished prose for AI-writing habits and highlights the stiff passages in yellow, orange, and red. You can paste text or analyze a public URL, up to 3,000 words, with no account. There is a separate free plagiarism checker for public web overlap.

ZeroGPT is someone else’s public detector. It also talks in percentages. It is not DetectGPT, not GPTZero, and not Turnitin. Their own ZeroGPT FAQ is the place to read how they describe the product, not a blog that treats every acronym as the same site.

If a thread said “run ZeroGPT,” they did not name DetectGPT. If they said “GPTZero,” they named a third product. Say the name of the box you actually opened.

Turnitin is a different room

A campus AI indicator lives inside an assignment. Students often cannot see it. Instructors can. What AI detector Turnitin uses is Turnitin’s own classifier, not a public paste box and not GPTZero bolted on.

DetectGPT will not reprint that campus number. ZeroGPT will not either. Preparing for a Turnitin dropbox still means writing like a person, keeping drafts, and running a self-check you can actually open. That self-check is DetectGPT if you are here.

When to use DetectGPT

Use DetectGPT when you want a free AI writing score plus highlighted lines, or when you also need a public overlap check on the same site. Use it when you cannot log into Feedback Studio. Use it when a client said “Turnitin” and meant any checker.

Run ZeroGPT too if you want a second public opinion. Expect disagreement. Does Turnitin detect ChatGPT is the campus question; DetectGPT is the rehearsal you can do without a seat.

Do not pick a winner based on which dashboard is kinder. Pick the lines you can rewrite.

FAQs

Is DetectGPT the same as ZeroGPT?
No. DetectGPT is detectgpt.io. ZeroGPT is a different public detector. GPTZero is a third company.
Which score will Turnitin show?
Neither of these. Turnitin’s AI indicator is their campus classifier. Public checkers do not reprint it.
Should I run both DetectGPT and ZeroGPT?
You can. Treat them as two signals. Edit the stiff lines either way.
Does DetectGPT only check ChatGPT?
No. DetectGPT is the brand. It scores writing from ChatGPT, Claude, Grok, Gemini, and other models.
Is DetectGPT free?
Yes. No account, 3,000 words per run, paste or URL.

The bottom line

Name the tool you actually used, because DetectGPT, ZeroGPT, GPTZero, and Turnitin are four different reports even when they all spit out a percentage.

Run the checker you can open, rewrite the lines that still sound generated, and keep a copy of each version.

DetectGPT is the free AI writing checker for that job.

Try DetectGPT free today

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Turnitin® is a registered trademark of Turnitin, LLC. DetectGPT is not affiliated with, endorsed by, or sponsored by Turnitin, LLC.