AI detector
What the AI detector does
The AI detector is a free AI text checker: paste in a paragraph, essay, email or comment, and it checks the writing against patterns shared across AI writing tools, ChatGPT, Claude, Gemini, Grok, DeepSeek and the rest. It answers the question people type into a search bar, is this AI generated text, with a plain-language list of what it found and why, not a single score standing in for a question nobody can fully answer.
This is a server tool, not a browser script. Your text is sent to our AI server to be scored; you get 5 free checks in any rolling 24 hours. There's no account to create, and no text you paste is needed twice.
What comes back is a list, not a verdict. A detector that hands you a bare number asks for blind trust; this one names each pattern it found (a formulaic opener, an even sentence rhythm, a cluster of stock transitions) so you can weigh the evidence yourself.
How it works
How to check text with the AI detector in three steps
There's no setup and nothing to format first. Paste the text, run the check, and read what comes back.
- Step 1
- Paste the text you want checked. A paragraph is enough to run; a longer sample gives the check more rhythm and structure to weigh.
- Step 2
- Press Check text. It goes to our AI server once, gets scored against common AI writing patterns, and the result returns to the page.
- Step 3
- Read each flagged signal and the reason behind it, then judge for yourself. The detector explains its reasoning; it doesn't hand down a ruling.
The signals
The patterns an AI text detector actually looks for
Whichever company built the model, its output tends to share a statistical shape: predictable word choices, evenly paced sentences, and a small set of recurring transitions and hedges. None of these prove anything alone. Stacked across a page, they're what a general AI detector reads for.
- Even sentence rhythm
- Sentences that land close to the same length again and again, where human writing usually lurches: short, then long, then short.
- Formulaic openers
- A first line that fits almost any topic, “In today's fast-paced world” being the classic case.
- Stock transitions
- Moreover, furthermore, additionally: correct English that few people reach for in ordinary writing.
- Weightless hedges
- “It's important to note that” and its relatives, phrasing that announces information rather than giving any.
- Low surprise, word to word
- Prose where each word sits close to the statistically expected next word, reading smooth but faintly generic.
- An unprompted closing summary
- A final paragraph that restates the piece instead of ending it.
Straight answer
Can you tell which AI model wrote something?
Not with certainty. The major model families train on overlapping data and keep converging toward similar phrasing, so differences between one model's output and another's are a matter of degree, not a clean fingerprint.
A system prompt erodes the signal further: tell any model to write short, blunt sentences with no hedging, and most of its default habits disappear. What this detector reports is patterns typical of AI writing in general, not a claim about which model, or which person, wrote a piece of text. Treat a match as a lead worth a closer look, never an answer on its own.
That's why this site also runs a detector tuned to each model family. A model-specific check reads for narrower habits, ChatGPT's transitions, Gemini's formatting reflexes, Grok's asides, that a broad check can miss.
Why flags happen
Why false positives happen
The patterns this detector looks for are, in places, just good writing. Careful academic prose hedges on purpose, because overstating a claim is the worse mistake. A rigid house style that avoids contractions and favours even, measured sentences reads the way a model does, for reasons that have nothing to do with one.
Second-language writers get flagged often, and it isn't a fair result. Formal connectors and consistent sentence structure are exactly what an ESL course teaches. A flag here is one data point, not a verdict on the writer.
If you're flagged
What to do if you're accused of using AI
A flag is a signal, not a verdict; no one should treat it as a finished case. If someone has questioned your own writing, the strongest response is evidence of process, not an argument about the tool.
- Keep your drafts
- Outlines, early versions and notes are the plainest evidence a piece grew, rather than appeared whole.
- Keep version history on
- Docs, Word and most editors log revisions automatically. Leave it running while a question is open.
- Be ready to talk through the work
- Someone who wrote a piece can usually explain a specific choice in it. That's hard to fake.
- Ask what the flag actually found
- A named signal (sentence rhythm, a cluster of stock phrases) can be discussed on its merits. A bare score can't.
Who uses it
Who uses the AI detector, and when
Same tool, several reasons to open it.
- Editors and publishers
- Screening submissions for signs of an unedited AI draft before it reaches a human editor's time.
- Teachers
- Getting a second opinion on writing that reads unusually smooth, as one input among several.
- Hiring teams
- Checking whether a writing sample matches the voice shown live in an interview.
- Writers checking their own drafts
- Running a piece through before sending it, to see whether their own habits read as machine-typical.
- Community moderators
- Getting a quick read on a batch of posts that all arrived sounding alike, before deciding whether to look closer.
Free checks
How many free AI detector checks you get, and why
This is a server tool: your text travels to our AI server to be scored, then the result travels back. That round trip makes the check possible, and it's why there's a limit on it.
You get 5 free checks in any rolling 24 hours, tracked without an account, on a ceiling that resets on a rolling clock rather than a fixed hour. Five is enough for most real uses: one submission, one email, one flagged paragraph at a time.