AI GPTZero checker
What the AI GPTZero checker does
This app runs a piece of AI-generated text through a check built around perplexity and burstiness, the low-predictability, evenly-paced writing that a GPTZero-style checker tends to notice, and hands back a plain breakdown instead of a guessed number. It's built for the question people ask before pasting text anywhere else: will this look machine-written.
It's a server tool. Text goes to our AI server, gets scored against known AI-writing patterns, and the result comes back to the page. You get 5 free checks in any rolling 24 hours, no account or upgrade screen involved.
The app has no access to GPTZero's own system and never rewrites your text. Each pattern comes with a plain reason, so you're the one deciding what the result means.
How this kind of check works
What perplexity and burstiness actually measure
Perplexity measures how predictable each next word is to a language model. Safe, expected word choices score low; more surprising, specific wording scores higher. AI-generated text tends to sit on the low end.
Burstiness measures how much that predictability varies across a document. Human writing tends to burst between short and long sentences, plain and complex ones. AI-generated text tends to stay flatter. Neither measure proves anything alone; both are imperfect proxies.
Workflow
How to run the AI GPTZero checker on your text in three steps
No setup, no format to match. Paste plain text and get a plain-language result.
- 1. Paste your text
- Drop in the draft, essay or paragraph you're checking. More text gives the app more rhythm to measure.
- 2. Run the check
- It goes to our AI server once, gets scored, and the flagged patterns come back, nothing queued or run twice.
- 3. Read the flags, not a score
- Each signal ships with a plain-language reason. Use it to judge what the result means for your piece.
The honest limit
Can the app predict what GPTZero will report?
No, and the app isn't going to pretend otherwise. GPTZero's exact scoring model, thresholds and training data are proprietary, and the company updates them without public notice. Claiming to reproduce its number would be a guess dressed up as precision.
What the app can do honestly is report perplexity-and-burstiness-style patterns in the text itself, a genuinely useful signal that's simply separate from whatever GPTZero would return.
Why flags happen
Why honest writing still gets flagged
Low perplexity and low burstiness aren't unique to AI. Plenty of careful human writing shares the same flat rhythm for reasons that have nothing to do with a chatbot.
- Second-language writers
- Careful writing in a non-native language tends to favor safe, predictable word choices, which reads as low perplexity.
- Neurodivergent writers
- Some writers naturally produce more even, formulaic sentence rhythm, which reads as machine-typical to a burstiness check.
- Formulaic professional prose
- Technical manuals and compliance documents are written to be predictable on purpose.
- Heavily edited AI drafts
- Sentence-by-sentence human rewriting can raise both measures without the content becoming genuinely different.
If it happens to you
What to do if you're wrongly flagged
A flag from this app, or any tool, is a signal, not a verdict. Evidence of your process is the strongest response, and institutions set their own policy for what follows.
- Keep every draft
- Outlines and earlier versions are the clearest proof a piece was built, not generated whole.
- Leave version history on
- Most editors track revisions automatically. Don't clear it while a question is open.
- Ask exactly what was flagged
- A named pattern is something you can discuss. A bare score isn't.
Who it's for
Who uses the AI GPTZero checker, and when
Different people reach for it at different points before a document is reviewed.
- Students
- A private check before submission, alongside their own honest read of the draft.
- Editors
- Screening submissions for unusually flat sentence rhythm before a full editorial pass.
- Hiring teams
- Checking whether a writing sample reads noticeably flatter than the rest of an application.
The limit, explained
How many free checks you get a day
Checking this way needs a model running on our AI server, not something that can happen locally in a browser. Text is sent over, scored, and the result comes straight back.
That round trip is metered: 5 free checks in any rolling 24 hours, no account required. It resets as the window rolls forward rather than at a fixed hour.