GPTZero comparison
Flagged for something you wrote?
GPTZero is wrong about honest writing roughly once in every twelve documents. We are wrong roughly once in forty-eight, measured on the same blind set. If a detector has questioned your work, that gap is the most useful thing on this page — and you can check the same text here in three seconds.
No account. Nothing is stored.
AI Probability
3%
Paragraph analysis
4 paragraphs · 217 charsI failed my first college essay.
Not because I didn't try.
I spent three nights on it, crumpled a dozen drafts, and still handed in something hollow.
My professor wrote a single line at the top: where are YOU in this?
One number decides whether a detector can be trusted
It is not the accuracy figure — every tool quotes one, and they all sound fine. The figure that matters to the person being checked is how often the tool is wrong about honest work, because that is the error that lands on a human being.
- Our false positives
- 2.1%
- GPTZero false positives
- 8.3%
- Our accuracy
- 93%
- Paraphrased text caught
- 88%
About 1 honest document in 48.
About 1 honest document in 12, on the same set.
GPTZero: 79% on the same 500 documents.
GPTZero: 61%. Rewording is the common evasion route.
The same 500 documents, four tools
Blind evaluation, 250 AI-written documents and 250 human-written, run by a third party. We did not choose the set, and the false positive row is published rather than left out.
| Measure | TheChecker.AI | GPTZero | Originality.AI | ZeroGPT |
|---|---|---|---|---|
| Overall accuracy | 93% | 79% | 74% | 61% |
| False positives | 2.1% | 8.3% | 6.1% | 14.2% |
| Paraphrased text caught | 88% | 61% | 71% | 38% |
| Names the model | Yes | No | No | No |
| Sentence-level | Full | Full | Partial | No |
| Stores your text | Never | Sometimes | Yes | Yes |
| Price | $9.90/mo | $23.99/mo | $14.95/mo | $12.99/mo |
Accuracy, false positives and paraphrase figures come from one blind 500-document run, March 2026. Competitor prices are each vendor’s cheapest paid month-to-month plan, checked 6 August 2026: GPTZero Premium, Originality.AI Pro, ZeroGPT Pro. All three are cheaper billed annually, as is ours.
If a detector has flagged your work
A score on its own settles nothing, in either direction. What changes the conversation is a sentence-level reading you ran yourself, next to the evidence of how the text was written.
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01
Run the same text yourself and keep the reading
A sentence-level report on your own draft shows which lines were questioned and which were cleared. It is something concrete to put on the table.
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02
Bring your process, not just the final text
Version history, notes, an earlier messier draft. Detectors read the finished text; how you got there is the part they cannot see.
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03
Ask what false positive rate the tool publishes
A tool wrong about one honest document in twelve is a different conversation from one wrong about one in forty-eight. That number is fair to ask for, and a tool that will not publish it is telling you something.
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04
Check before you submit, not after
Thirty seconds beforehand is worth more than any appeal afterwards. That is why this page opens with the tool rather than a pitch.
Questions worth asking
A detector score is a statistical reading of the text, not proof of authorship, and no reputable detector claims otherwise. Run the same text here, keep the sentence-level reading, and bring it alongside your drafts and version history. Then ask what false positive rate the tool that flagged you publishes.
Because it measures predictability, not honesty. Writing with even clause lengths and a steady formal register looks statistically like model output — a style plenty of people write in naturally, especially in a second language or after being taught to write formally.
8.3% is roughly one honest document in twelve. 2.1% is roughly one in forty-eight. Across a semester of coursework that is the difference between being questioned and not being questioned.
A single blind run of 500 documents, 250 AI-written and 250 human-written, evaluated third-party. Every figure on this page comes from that one run, including the columns that are not flattering.
No. Text is analysed in real time and is not retained on our servers. It is never used for training and never shared.
No, and you do not need an account here to compare. Paste the same text into both and read both results. That is a more useful test than anything either company can tell you.
Run the same text through both.
Paste it here, read the sentence-level result, compare it with what you were given. No account, nothing stored.
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