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AI Detector

Paste text, get an honest AI-probability estimate — with the specific stylistic signals that led to the verdict.

  • AI powered
  • Server processed
  • Free
  • No signup
Paste text to analyze 0 chars

No detector is 100% accurate — treat this as a probabilistic guide, not a verdict. Your text is sent for analysis, then discarded immediately and never logged.

This tool sends your input to an AI model on our server to produce a result.

How to use AI Detector

  1. Paste at least 200 characters of text into the box. Shorter samples don't give reliable results.
  2. Click Analyze. Claude reads the text and estimates AI probability based on rhythm, vocabulary, hedging patterns, and generic transitions.
  3. Review the verdict card: probability %, category (human / likely_human / mixed / likely_ai / ai), and the specific signals observed.
  4. Use the result as a guide — not a court verdict. Real AI detection is inherently probabilistic.

Common use cases

  • Teachers reviewing student work. Flag suspicious submissions for a conversation, not immediate accusations. Combined with your knowledge of the student's voice, the signals help you have an informed discussion.
  • Editors screening freelance content. Contributors sometimes submit AI drafts as their own work. AI Detector flags the ones worth a closer look.
  • Writers self-checking. You used ChatGPT to brainstorm and now the paragraph reads too polished. AI Detector confirms if it still sounds AI — then use AI Humanizer to fix it.
  • Content teams auditing AI use policy. Random sampling of published content to check that AI-use policies are being followed.
  • Recruiters checking cover letters. Not to disqualify candidates who used AI — but to have a signal on whether the writing represents their voice.

Tips

  • Minimum 200 characters for reliable analysis. Under that, stylistic signals aren't enough.
  • Longer samples (1,000+ chars) give more confident results than short ones.
  • The verdict card includes specific signals — read those. They're more useful than the probability number alone.
  • Text that was heavily edited by a human AFTER an AI draft will often pass as human — because at that point it effectively is.

Troubleshooting

It's flagging my own writing as AI.
Some human writing genuinely mirrors AI patterns — formulaic academic prose, hedged corporate writing, or writing that follows very structured templates. The signals list shows what triggered the verdict.
AI text passed as human.
Well-humanized AI output (via editing or an AI Humanizer tool) can genuinely be undetectable. No detector is 100% accurate — this is a fundamental limit, not a bug.
Different result on the same text.
AI analysis has slight non-determinism. The verdict category is usually stable; the exact probability % may vary ±5-10 points between runs.

Frequently asked questions

How accurate is this?
Real accuracy for consumer-grade AI detection is 70-85% on unedited AI output, dropping to 40-60% on heavily edited or humanized text. This is the current state of the art — not a limit of our tool specifically. Treat the result as one signal among many.
Is my text stored?
No. Zero-retention on both our server and Anthropic's Claude API.
Which AI models does it detect?
It analyzes stylistic patterns common to LLM output in general — so it works on text from ChatGPT (GPT-4, GPT-5), Claude, Gemini, Llama, Mistral, and most other current models.
What's the minimum text length?
200 characters. Below that, stylistic signals are too sparse to be reliable.
Does it detect specific paragraphs within a longer text?
This version analyzes the whole submission as one unit. For paragraph-level detection, paste each paragraph separately.
How does it differ from other detectors like GPTZero or Originality.ai?
Other detectors use perplexity models trained specifically for detection. Our detector uses Claude's general analysis capability with a structured prompt. Neither approach is definitively better — both are probabilistic. Ours is fully explainable (returns specific signals), free, and doesn't require signup.