ZeroGPT Review (2026): Accuracy, False Positives & Pricing

ZeroGPT (zerogpt.com) is a browser-based AI text detector run by Olive Works LLC, a Wyoming company that trades as ZeroGPT. You paste a passage or upload a file, and ZeroGPT returns a percentage with the sentences it considers machine-written marked in the text. The site also sells a plagiarism checker, an AI image detector, a summarizer, a paraphraser, a translator and an AI humanizer under the same account, and ZeroGPT says the detector supports "all the languages" and covers "35+ LLM families". This review is for the student whose own writing just came back flagged, and the teacher or editor deciding whether a ZeroGPT number counts for anything.

What does the ZeroGPT percentage actually mean?

The ZeroGPT percentage is the tool's estimate of how much of the pasted text looks machine-written. It is not the probability that a person did or did not write the text, and a 40% score does not mean 40% of the words came from ChatGPT. The marked sentences are the only explanation ZeroGPT gives; it publishes no method that would let you check why a sentence was marked. ZeroGPT's own Terms of Use (version 2.0, updated October 7, 2026) state that a ZeroGPT score "does not constitute definitive proof" of authorship.

Is ZeroGPT accurate?

ZeroGPT is not accurate enough to prove who wrote a text. The ZeroGPT homepage, read on October 29, 2026, claims 98.4% detection accuracy and a false positive rate under 1%. Every outside check of ZeroGPT we could trace was run by a competing detector or compiled second-hand, and those checks report lower figures that also disagree with each other.

A false positive here means human writing scored as AI. For a student, that is the error that matters, because it is the one that leads to an accusation.

What ZeroGPT claims vs what published tests found

The table lists every ZeroGPT accuracy figure in the sources for this review and who produced it. Only one comes from a peer-reviewed study, and that study tested ZeroGPT in March 2023 alongside six other detectors.

Fast.io's 67-85% range is far below the vendor's 98.4%, but it is borrowed, and its own false positive range shifts between sections. GPTZero's test is the best documented competitor check, with human samples linked and raw outputs shared, and it is still 13 texts run once by a company selling the alternative. ZeroGPT's accuracy on current AI models has not been measured independently in anything we could find.

Does ZeroGPT detect ChatGPT and edited AI text?

ZeroGPT can catch plain, unedited AI text: Winston AI's single Claude-written essay came back 93.3% AI. Edited, translated or mixed text is where the record turns against it. In the Liang et al. study, asking ChatGPT to rewrite its own essays in more literary language cut detection across the seven tested detectors from up to 100% to up to 13%. One Reddit user scored a story they had translated and edited with AI help at 2.4% on ZeroGPT, lower than a 1973 human-written excerpt (details below). No independent test of ZeroGPT on edited text from current models was found.

Does ZeroGPT give false positives on human writing?

Yes: dated user reports describe ZeroGPT scoring human writing as AI, including writing produced long before AI tools existed. About five of the 16 dated Reddit reports in our sample describe human text flagged as AI. That count comes from people who chose to post, so it shows the error happens and keeps happening; it cannot show how often.

Does ZeroGPT flag famous or pre-AI texts as AI?

One dated report says it did with a famous text. u/I-had-a-plan wrote on r/InsideIndianMarriage on October 1, 2026 that a ZeroGPT check of the Gettysburg Address came back "98% percent AI". A second report concerns private files, not a famous text: u/SquiDevWasHere on r/laptops (October 5, 2026) said their grandfather's software papers from his Canadian Navy days, unopened since 1992 and still on floppy disks, ran through ZeroGPT and "it thinks it's AI". A third shows a smaller effect: u/Chance_Swordfish_687 on r/AIWritingLounge (October 7, 2026) ran an excerpt of Ursula K. Le Guin's 1973 story "The Ones Who Walk Away from Omelas" and got "7.7% AI-generated", higher than the 2.4% their own AI-assisted story received. No language model existed when any of these texts were written, so any AI share in them is an error.

Are non-native English writers flagged more often?

Non-native writers face a documented risk, and ZeroGPT was part of the test that documented it. In the 2023 Liang et al. study in Patterns, seven detectors including ZeroGPT flagged 91 TOEFL essays by non-native speakers as AI at an average rate of 61.3%, while classifying US eighth-graders' essays accurately. That average covers all seven tools as they were in March 2023, so it is not ZeroGPT's own current rate. u/Marcu3s, a non-native English speaker, reported on r/Marathon on September 30, 2026 running their own text through Grammarly, ZeroGPT and QuillBot and that "all of them say it is 100% AI written", typos included.

A high ZeroGPT score on plain, formal, grammatically uniform prose may reflect style, not origin.

What do Reddit users report about ZeroGPT?

Most of the 16 dated Reddit comments in our sample, posted between September 29 and October 9, 2026, call ZeroGPT unreliable; a smaller group defends it or reports clean results. They are anecdotes, not controlled measurements, and each links to the exact comment.

The complaints:

• u/GuardMarmot on r/NonPoliticalTwitter (September 29, 2026) called ZeroGPT "garbage", with "false positives and false negatives all over the place", and said it stays popular because it is quick, free and needs no signup.
• u/Beautiful_Quit8141 on r/SourdoughStarter (October 9, 2026) wrote that ZeroGPT "flags human writing all the time".
• u/NotLoud_Example on r/GachaTouristCringe (October 4, 2026) called ZeroGPT "untrustworthy" after trying many checkers.
• u/That_Car_Dude_Aus, writing as a moderator on r/CarsAustralia (October 7, 2026), said ZeroGPT was not sure about a post and that even the detection "tools" are hit and miss.
• u/gnomehouse on r/burlington (October 8, 2026) replied to a commenter whom ZeroGPT had backed that Pangram, "the one that actually works", found the text to be AI. Nobody in that thread knew who wrote the text, so this is a disagreement between detectors, not a confirmed miss.

On score instability, about five reports describe detectors disagreeing on the same text or swinging on small changes:

• u/shaky2236 on r/writers (September 29, 2026) posted three scores for one text: "ZeroGPT - 34% AI", 0% from QuillBot (spelled "Quilibot" in the comment) and 100% from a tool the commenter called "Panoramic".
• u/tharok2090 on r/espanahabla (October 5, 2026) listed ZeroGPT at "39.9%" on a post that GPTZero put at 50% and Grammarly at 80%.
• u/Lumpy-Car-4086 on r/SideProject (October 8, 2026) said that on Spanish text ZeroGPT was the hardest detector to predict, and that "a one-word fix took a paragraph from 0% to 62%".
• u/Sythriox on r/classicwow (October 2, 2026) reported their own text at "ZeroGPT: 0%", with GPTZero at 6% on the same text.

The defenders and the clean results:

• u/xriddle on r/MadeMeSmile (October 1, 2026) described ZeroGPT as "an established company with many employees" while agreeing it is not perfect.
• u/XUrielleX on r/JubileeMains (September 30, 2026) said a ZeroGPT check in a cosplay-photo thread is "usually accurate" in their experience, while allowing for false results.
• u/Such_Disaster7620 on r/AirUniversity (September 30, 2026) said partly ChatGPT-written work showed "0% ai on zerogpt", but the instructor planned to use a different tool. A 0% on ZeroGPT says nothing about what your school's detector will return.

ZeroGPT also works as a casual referee: a r/datingoverforty moderator notice (October 1, 2026) requires anyone calling a post AI to link a screener such as ZeroGPT showing at least 51% AI.

Where does ZeroGPT's claim differ from what users report?

The sharpest contradiction is between ZeroGPT's homepage and ZeroGPT's own terms. Three points, each dated:

1. The homepage (read October 29, 2026) claims a false positive rate under 1% and 98.4% accuracy, with no published method.
2. The Terms of Use (version 2.0, October 7, 2026) list "False positives", "False negatives" and "Inconsistent results" among the outputs users may get, and say you "must not treat a ZeroGPT Output as the sole basis for a decision" affecting someone's education, employment or reputation.
3. Dated user reports, cited above, describe the Gettysburg Address at 98% AI, 1992 documents flagged, and a non-native writer's own text at 100%.

Three anecdotes cannot produce a rate or disprove a figure measured on a large sample. They show people meet the error often enough to post about it, and ZeroGPT's own legal text treats the score as a lead to check, not a finding.

How much does ZeroGPT cost? Free plan, Pro, Plus and Max

ZeroGPT has a free plan that checks 15,000 characters per detection, and three personal paid plans: Pro at $14.99 a month, Plus at $21.99 and Max at $30.99, each cheaper on annual billing. These are US-dollar figures from ZeroGPT's own plan data behind its pricing page, read on October 29, 2026; the pricing page has no region selector, so confirm the amount at your own checkout.

The pricing page advertises "40% off annually", and that figure is exact only for Pro. Plus works out to about 36% off and Max about 35% off. Plus and Pro share the same 100,000-character limit per detection and differ by ten batch files, so Plus is hard to justify for detection alone. An EDU plan is listed at $263.88 with 250,000 characters per detection, but ZeroGPT's plan data gives the same figure for both billing periods, so ask which period it covers before buying. The API is pay as you go from a prepaid balance, with API plan cards listing $0.042, $0.057 and $0.072 per 1,000 characters.

When is the free version of ZeroGPT not enough?

The free ZeroGPT plan stops being enough at 15,000 characters, which is roughly 2,500 words of English prose (our estimate, at about six characters per word including spaces). A typical 1,500-word essay fits in one check. A 10,000-word dissertation (about 60,000 characters) needs four or five separate free checks, and each chunk gets its own score. Those chunk scores may disagree with each other and with a whole-document score on a paid plan, leaving several numbers and no rule for combining them. The plan data also lists no batch file uploads on the free plan, so a teacher with 30 essays pastes them one at a time.

Pro at $14.99 a month fixes the length problem up to 100,000 characters, roughly 16,500 words, and Max at 150,000 characters covers about 25,000 words. A full PhD thesis of 80,000 words (around 480,000 characters) does not fit in one detection on any listed self-serve plan, including Expert at 350,000. A paid plan does not fix the reliability problem. Nothing in the sources for this review suggests paid ZeroGPT plans score human writing more accurately than the free one, so paying makes sense for length and volume, not for confidence.

Can you cancel ZeroGPT and get a refund?

You can cancel a ZeroGPT subscription at any time before the next renewal, but refunds are narrow. Per the Terms of Use dated October 7, 2026, subscriptions renew automatically until cancelled, and cancelling stops future renewals while the plan runs to the end of the paid period. A full refund can be requested within 10 hours of a first subscription purchase, or within 12 hours for an annual plan bought by accident. Refunds are limited to one per customer, and renewal payments, used periods and API balances are non-refundable. For a single paper, a monthly plan cancelled straight away caps the cost at one month.

Is ZeroGPT the same as GPTZero?

No. ZeroGPT (zerogpt.com, run by Olive Works LLC) and GPTZero (gptzero.me) are separate, unrelated companies with near-identical names. A score from one tells you nothing about the other.

On which is more accurate, we rate GPTZero 3.6 out of 5 and ZeroGPT 2.4, mainly because GPTZero documents more of its testing; our GPTZero review covers its own false positive problems with non-native writers. The only head-to-head test of ZeroGPT we found was published by GPTZero itself, so it cannot settle the question. Both tools were among the seven detectors in the 2023 Liang et al. study that flagged non-native writing at a 61.3% average. ZeroGPT's free plan is the more generous of the two for length: 15,000 characters per check against GPTZero's 5,000.

What should you do if ZeroGPT flags your writing?

If ZeroGPT flags writing you produced yourself, gather evidence of how you wrote it and ask which detector your school or client relies on. The reports above show one text getting 0%, 34% and 100% from different detectors.

What should a student do after a ZeroGPT flag?

A student flagged by ZeroGPT should start with their writing process. Version history in Google Docs or Word, drafts, notes and research files show a document built over time, which a detector score cannot. Ask your instructor which tool the institution uses, since a ZeroGPT result and the school's detector can differ. If a formal accusation follows, request the written policy and the appeal route, and point out that ZeroGPT's own terms say its output must not be the sole basis for a decision about your education.

Can teachers use ZeroGPT to grade?

No: ZeroGPT's own terms forbid treating its score as the sole basis for a decision about a student. Treat a high score as a reason to compare the submission with earlier work, review drafts and talk to the student. ZeroGPT and Turnitin are separate systems with separate models. If your institution uses Turnitin, the institutional result comes from Turnitin alone, so a ZeroGPT percentage can neither predict nor overrule it. For how a commercial checker and Turnitin differ, see how Copyleaks and Turnitin compare.

How does ZeroGPT compare with other AI detectors?

ZeroGPT has one of the larger free per-check limits of these detectors and the weakest documented reliability. The table uses our own published reviews and their verified dates; the ratings are ours, not the vendors'.

ZeroGPT alternatives

The right alternative depends on why you are checking. For a free second opinion without creating an account, Copyleaks accepts up to 25,000 characters per logged-out scan, as our Copyleaks review records, and the Sapling detector review covers a free 2,000-character check that needs no card. Teachers who want a free tier with classroom tooling can start with GPTZero. Editors screening freelance work at volume can look at credit-based tools: our Originality.ai review covers its false positive caveat for edited text, and the Winston AI review covers a paid option with a trial. Our ranked list of the best AI detectors puts all of them side by side.

Is ZeroGPT legit, and what happens to the text you paste?

ZeroGPT is a legitimate, working service run by Olive Works LLC, a limited liability company organized in Wyoming, United States; whether its scores are reliable is a separate question. Its Privacy Policy, last updated October 7, 2026, says ZeroGPT does not use private text you submit to train, retrain or fine-tune any AI model, its own or a third party's, and does not sell that text. Text you do not save to your account is kept "only for the period reasonably necessary" to run the service, a period the policy does not define, and it can be held longer for security, abuse prevention or legal claims. Service providers may process it where a feature needs them, and the policy names the United States, Germany and the European Economic Area as places data may be processed. You can ask for deletion through ZeroGPT's support email, but the policy allows some data to be kept and backups to hold it until overwritten. With no fixed retention limit, keep confidential manuscripts and client documents out of ZeroGPT and any free web detector.

Is ZeroGPT worth using?

ZeroGPT is worth using only as a free first look at a passage, never as evidence about who wrote it. We rate ZeroGPT 2.4 out of 5. The free 15,000-character check is quick and more generous than GPTZero's, and the privacy policy rules out training on your text. Against that, the 98.4% claim has no published method, ZeroGPT's own terms concede false positives, and dated reports describe human texts scored as AI. Pay for Pro at $14.99 a month only for longer documents or batch uploads, knowing the refund window closes 10 hours after purchase. Readers who need a better-documented tool should start with our detector rankings.

How we reviewed ZeroGPT, and what we did not test

This ZeroGPT review is built from ZeroGPT's own pages, read on October 29, 2026 (homepage, the plan data behind the pricing page, the Terms of Use and the Privacy Policy), the published reviews of ZeroGPT by GPTZero, Fast.io and Winston AI, the 2023 Liang et al. study, and 16 dated Reddit reports, each linked to the exact comment. We did not run ZeroGPT on any text, produced no accuracy figures of our own, and did not buy a plan. Word counts given for character limits are our estimates. Our review methodology explains the standards every review follows.

What has changed since earlier ZeroGPT reviews?

ZeroGPT publishes no changelog, so the timeline below records dated facts from the sources. We will add entries when ZeroGPT changes its plans, limits or claims.

• March 15, 2023: Liang et al. test ZeroGPT with six other detectors on TOEFL and US student essays.
• July 10, 2023: The study is published in Patterns, reporting a 61.3% average false positive rate on the TOEFL essays.
• June 27, 2024: Winston AI's ZeroGPT review lists $9.99 a month and Max at $26.99.
• June 23, 2026: Fast.io updates its ZeroGPT review with Free, Pro, Max and API tiers and a 67-85% accuracy range.
• July 20, 2026: GPTZero publishes its 13-sample test of ZeroGPT.
• October 7, 2026: ZeroGPT's current Terms of Use (version 2.0) and Privacy Policy take effect, with the 10-hour refund window and the no-sole-reliance clause.
• October 29, 2026: ZeroGPT's plan data lists Pro at $14.99 and Max at $30.99 a month, and the homepage claims 98.4% accuracy and under 1% false positives.
• November 3, 2026: This review is first published.

Does AI Tools Police have a stake in ZeroGPT?

No. AI Tools Police sells no AI detector and has no affiliate link with ZeroGPT on this page. If that changes, this note will say so. We re-check the claims on this page monthly. Last updated November 3, 2026.