Why We Built AI Detector

Most AI detectors give you a number. 87% AI-generated. Then they stop.

That number doesn’t tell you which sentences triggered the result. It doesn’t tell you why the score is high. And it definitely doesn’t tell you what to do next.

We built AI Detector because we needed something better — a tool that shows you the evidence, not just the verdict.

What Makes Us Different

Word-level heatmap. Every word gets an individual AI probability score. Hover over any word to see exactly how “AI-like” it reads. No other free detector does this.

Sentence-level analysis. See which sentences are likely AI-generated, which are borderline, and which read as fully human.

Rewrite suggestions. For every flagged sentence, we suggest a more natural, human-sounding alternative. Don’t just detect — fix.

No sign-up, no paywall. Paste text, click analyze, get results. That’s it. No email required, no credit card, no “free trial” that expires in 3 days.

How It Works

AI Detector analyzes five linguistic signals:

  1. AI phrase detection — Scans for phrases that are statistically overrepresented in AI-generated text (“furthermore,” “it is worth noting,” “plays a crucial role”)
  2. Sentence uniformity — Measures how uniform your sentence lengths are. AI tends to produce evenly-paced sentences; humans vary more
  3. Lexical diversity — Calculates your vocabulary range. AI often uses a narrower set of words than human writers
  4. Punctuation patterns — Examines comma-to-dash ratios and parenthetical usage
  5. Word-level statistical modeling — Flags individual words that appear with unusual frequency in AI-generated corpora

These signals are weighted and combined into a composite score. The heatmap visualizes per-word results so you can see — not just trust — the analysis.

What We Believe

  • AI detectors are tools, not judges. A high score doesn’t prove AI wrote it. A low score doesn’t prove a human did. Use detection as one data point among many.
  • Transparency beats authority. We show you every signal and let you decide. Black-box scores help no one.
  • Free means free. No bait-and-switch, no “upgrade to see full results,” no dark patterns.

Who Uses AI Detector

  • Content editors checking freelance submissions
  • SEO teams auditing content quality before publishing
  • Students verifying their own writing won’t be falsely flagged
  • Hiring managers reviewing writing samples
  • Writers who want to make AI-assisted drafts sound more natural

Frequently Asked Questions

Is AI Detector really free?

Yes. No sign-up, no usage limits, no hidden paywalls.

Can it detect ChatGPT, Claude, and Gemini?

It detects linguistic patterns common across all major AI models, including GPT-4o, Claude, Gemini, LLaMA, and Mistral.

How accurate is it?

No AI detector is 100% accurate. Our tool performs best on unedited AI text (85-95% accuracy) and is transparent about limitations. Read our accuracy guide for details.

Does it store my text?

No. All analysis runs in your browser. Nothing is sent to a server.

Can AI detectors be fooled?

Yes. Paraphrasing, mixing human and AI text, or using rewriting tools can reduce detection accuracy. This is true of all AI detectors, not just ours. See why AI detectors get it wrong.