WrittenCheck.com vs ZeroGPT.com: Which Tool Should You Trust?

WrittenCheck.com and ZeroGPT.com: Which Tool Should You Trust?

AI text detectors now sit in the middle of schoolwork, hiring and publishing. A single score can make a teacher doubt a student or lead an editor to reject an article. So the question is not just which tool is popular, but which one deserves your trust.

This article compares two detectors, WrittenCheck.com and ZeroGPT.com, using what each site states about itself and what published reviews and studies say. Where a source has a commercial interest, we say so.

What Is WrittenCheck.com?

Written Check is a free AI text detector. According to its site, it estimates how much a text reads like AI-generated writing and gives a 0 to 100 score, a likely range, a confidence level, and sentence-by-sentence marking. It does not try to say which AI tool wrote the text.

Other details listed on the site:

• Limits: 40 to 3,000 words per check, up to 8 checks per minute and 200 per day. Texts under 80 words get low confidence.
• Input: Paste text or upload DOCX, PDF or TXT files. A free Android app can also scan printed pages.
• Price: Free, with no sign-up and no paid plan.
• Privacy: The site says text is checked in memory, not stored, not used for training, and not sent to other AI services.
• Languages: 17 languages, including English, Arabic, Hindi and Urdu. Only English has its own dedicated model, and the site says other languages are less reliable.
• Not offered: Plagiarism checking. The site says it does not compare text against web pages or papers.

WrittenCheck also states its limits openly: scores are estimates, not proof of authorship, and results are weaker for short texts, edited AI drafts, unusual styles and some formal human writing.

What Is ZeroGPT.com?

ZeroGPT is one of the best-known AI detectors, bundled with a wider set of writing tools. Its homepage lists an AI detector with highlighted sentences and a percentage gauge, a plagiarism checker, an AI humanizer, a paraphraser, a summarizer, a grammar checker, a translator, and image and video detectors. It also lists API access and premium plans.

The site claims 98.4% detection accuracy, a false positive rate under 1%, and coverage of 35+ language-model families. The page does not explain how those figures were measured. The free detector box shows a 15,000-character limit.

Pricing is not listed on the homepage. A June 2026 review by Fastio reported a free ad-supported tier, a Pro plan at about $9.99 per month and a Max plan at about $26.99 per month. Check ZeroGPT’s pricing page for current numbers.

The Criticism of ZeroGPT: What Published Reviews Say

ZeroGPT has drawn consistent criticism over accuracy. Here is what published sources report, with context on who wrote them.

Marketing claims versus independent results. The Fastio review contrasts ZeroGPT’s 98% claim with third-party tests that put accuracy roughly between 67% and 85%. It also reports false positive rates on human writing of about 20% in one small test and about 26% in a large analysis of student essays. Fastio did not run these tests itself; it summarizes other organizations’ work, some of which sell competing products.

Weak on edited or newer AI text. The same review says ZeroGPT caught most unedited GPT-5 text but only about 22% of paraphrased text. A review from competitor aicheckr also says light editing often makes ZeroGPT return a “likely human” result and that its methodology is not published in detail. That site sells a rival detector and names no sources for its figures, so treat its numbers as rough opinion.

Inconsistent results by writing style. GPTZero’s review tested ZeroGPT on six AI samples and seven pre-2020 human samples. Scores on AI text ranged from about 30% to 100%, with narrative writing performing worst. GPTZero is a direct competitor and the sample was only 13 texts, so this is a small test, not proof.

A fair counterpoint. The same GPTZero test found that ZeroGPT labeled every human sample as human-written, with scores from 0% to about 19% AI. So the evidence is mixed: criticism centers on missed AI text and on inconsistent numbers, while some tests show fewer false accusations than others report.

A wider problem. A well-known Stanford-led study found that GPT detectors tend to misclassify writing by non-native English speakers as AI-generated. This is a risk for any detector, including ZeroGPT, and it matters for students writing in a second language.

WrittenCheck.com vs ZeroGPT.com: Feature Comparison

How Much Should You Trust Each Accuracy Claim?

Both sites publish impressive numbers, and neither set has been independently confirmed.

WrittenCheck reports a held-out test dated 14 October 2026 on 15,089 non-English texts across 16 languages. It does not give English-specific figures on that page, and the test is self-published. We found no independent review of WrittenCheck, so these results should be treated as a claim to verify, not a fact.

ZeroGPT’s figures come with no explained method, and independent and competitor tests report much lower accuracy. That gap is the main reason for caution.

Which Tool Should You Trust?

On the evidence available, WrittenCheck is the more trustworthy choice of the two for quick AI-detection checks. The reasons are practical:

1. Transparency. It states its limits, says scores are estimates, and gives test details with dates and sample sizes. ZeroGPT’s headline figures come without a method.
2. Cost and privacy. It is free with no sign-up, and it states that submitted text is not stored or used for training.
3. Useful output. A range, a confidence level and sentence marking show uncertainty better than a single percentage.
4. Language coverage. It lists 17 languages, including Urdu, though non-English results are less reliable.

ZeroGPT is still the better fit if you need a bundle of tools in one place, such as a plagiarism checker, paraphraser or API.

The honest caveat: WrittenCheck’s strengths rest largely on its own statements. If its numbers hold up in independent testing, the case gets stronger. Until then, treat it as the better-documented option, not a proven one.

How to Use Any AI Detector Responsibly

• Never treat a score as proof. Every detector produces false positives and misses edited AI text.
• Test with text you know. Paste something you wrote years ago and see what the tool says.
• Use two sources. If a result matters, check it with a second tool and with human judgment.
• Look at drafts and history. Version history, notes and an honest conversation tell you more than a percentage.
• Take extra care with non-native writers, given the documented bias in detectors.

Final Verdict

If you need a free, private, plainly explained AI check, WrittenCheck.com is the one to try first. If you need a broader toolkit and accept the accuracy caveats, ZeroGPT remains an option. For high-stakes decisions such as grades, jobs or publishing, no AI detector should be the only evidence.

Sandeep Kumar

Sandeep Kumar is the Founder & CEO of Aitude, a leading AI tools, research, and tutorial platform dedicated to empowering learners, researchers, and innovators. Under his leadership, Aitude has become a go-to resource for those seeking the latest in artificial intelligence, machine learning, computer vision, and development strategies.