AI Writing Detector
Estimate how AI-generated a piece of writing looks.
Heuristic, not a real detector.
Even paid AI detectors have 20-30% false positive rates. This tool is weaker than that. Don’t use the score to accuse anyone of cheating. Use it to sanity-check your own writing.
0 words
Need at least 50 words for a meaningful read. Longer is better.
About
Paste any essay or article and the tool runs a handful of statistical checks: sentence length variance, vocabulary diversity, AI cliche phrases, em-dash frequency, contraction usage, and a few others. Each signal is shown separately so you can see what's flagging. Combined into a single percent likelihood. This is a heuristic, not a real detector. False positives are common. Don't use it to accuse anyone of cheating.
How to use
- Paste a piece of writing (longer is more reliable).
- Read the per-signal breakdown.
- Treat the final score as a hint, not a verdict.
FAQ
How accurate is this?+
Not accurate enough to make accusations with. Even paid detectors have 20 to 30 percent false positive rates on human writing. A heuristic-only tool like this is worse. Treat the score as a 'does this feel like AI?' signal, nothing more.
Can a human writer trip this?+
Yes. Writers who use formal academic style, lots of transitions, and em dashes will score high even if they wrote everything themselves. People taught to write a certain way score higher.
Can AI text get a low score?+
Easily. Modern models can be prompted to write less formulaically, use contractions, vary sentence length, and avoid the obvious phrases. Once that happens, surface-level detection breaks down.
What signals does it use?+
Sentence length variance (burstiness), average sentence length, vocabulary diversity (type-token ratio), AI cliche phrase count, em-dash frequency per 100 words, contraction ratio, and repeated transition words.
Should I use this on a student's essay?+
No. Use it as a self-check on your own writing if you want to sound less AI-like. Don't use it as evidence against anyone. The error rate is too high and the consequences of being wrong are too serious.